ARVT80

Normal run states on the triple display. idle = standby. Ht1 / Ht2 = low / high heat. CF = continuous fan. CL1 / CL2 = cooling stage.

1. 1 Confirm this is not a fault

   On the Amana ARVT80 this readout (idle / Ht1 / Ht2 / CF / CL1 / CL2) is run status, not a lockout. Write what the display actually shows and whether W/Y/G is present at the IFC.

   Expect: Idle / Ht / CF / stage+CFM words change when you apply and remove the call.

   If fail: If the word never changes on a real call, the call is not reaching this IFC.

   If pass: The board is alive. Diagnose the comfort complaint, not this code.

2. 2 Prove the call at the board

   Measure R to W / Y / G at the Amana ARVT80 IFC, not at the thermostat. Communicating plates need the data pair and a live indoor address — 24 V on W is not the test.

   Expect: Do not replace the board because it says Ht1 or CF.

   If fail: Fix the stat, harness, or data pair before you change parts.

3. 3 Watch one full sequence

   Leave power on. Watch ComfortBridge 80% IFC — ARVT80 card, metal-vent E2/E9 through one cycle and write the first real fault that replaces this status word.

   Expect: Call: Communicating stat requests heat capacity. On 24V fallback, W1/W2 behave like a two-stage furnace but blower CFM still comes from the IFC tables, not taps.

Control failed to sense flame after 3 full ignition retries and shut off gas. Auto-resets after 1 hour (or a tstat cycle).

1. 1 Watch one full try — do not reset

   Write the Amana ARVT80 code. Watch inducer, HSI glow, valve click, flame, µA. The step that dies is the repair. Resetting only burns another try into a harder lockout. Watch one full try: inducer, HSI glow, valve click, flame, µA.

   Expect: Call → Prove limits → Low inducer / LPS → HSI / low-fire valve → Blower → High fire → Satisfied

2. 2 Gas and the valve

   Cock open, inlet pressure, then manifold on the stage that is failing vs the rating plate. 24 VAC at the valve during trial? Coil ohms? A valve that never opens looks like a ‘bad igniter’ if you did not watch the sequence. Gas supply and manifold (low then high).

   Expect: Manifold low / high: Natural ~1.6–1.9 / 3.2–3.5 in. w.c. class — rating plate wins. Clock input if in doubt.

3. 3 Flame prove, then the lockout timer

   Glow + valve + no prove → rod, ground, or IFC sense. Prove then drop → µA / PS / limit. Soft lockouts on this family often auto-reset on a long clock — do not sit on resets. Ground and flame-rod cleanliness.

   Expect: Flame rod: µA per this IFC sticker, not the AR9T96 card. Rising while running is the goal.

Low-stage pressure switch is made with the inducer off. Control waits for the fault to clear.

1. 1 Unplug the switch with the inducer off

   On Amana ARVT80 this code is the switch made when the inducer is not running. Unplug that switch only. This is Category I metal vent. There is no 96% collector or PVC trap to prime.

   Expect: Code changes when the harness is open.

   If fail: Wrong switch, or the IFC input is shorted.

   If pass: Switch/hose path. Go to step 2.

2. 2 Water in the hose vs a welded switch

   Blow the hose. Water holding residual draft is more common than a welded switch. Confirm the hose is not teed and not routed uphill. Ohm the switch with the hose off. Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

   Expect: Hose empty. Switch opens with no draft.

3. 3 IFC input last

   If the switch ohms open, the hose is dry, and the code does not change with the harness off, the Amana ARVT80 IFC input is shorted. Do not keep swapping switches. Unplug the LPS. If the code changes, the switch is welded or the hose is holding residual draft.

   Expect: Known-good open switch + open harness = code gone. If not, IFC.

Inducer is on low and the low-stage switch did not close within 5 minutes. Then 1-hour lockout and retry.

1. 1 Prove inducer and the live code

   Do not pull power — that clears the Amana ARVT80 active code. Write E2. Is the inducer spinning on this call? Silent inducer is not a pressure switch. This is Category I metal vent. There is no 96% collector or PVC trap to prime.

   Expect: 120 VAC at the inducer on a heat call. Wheel turning.

   If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.

   If pass: Inducer running + this code → trap, hose, switch, vent (step 2).

2. 2 Trap, collector, and the hose

   A drowned 96% trap will not make collector pressure. Pull the trap, flush it, confirm the collector box and inducer outlet are not full. Hose cracked, off the port, or full of water fakes an open switch. Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

   Expect: Trap flowing, hose dry and downhill, ports not swapped on a two-switch board.

3. 3 Switch ohms, then vent load

   Ohm the pressure switch: NO, must close when that inducer speed is making the collector setpoint. If the switch is good, walk the PVC — bird screen, ice, long 2" run, wind, shared chase. Inducer spinning? 120 VAC at the inducer on a heat call.

   Expect: LPS / HPS: Both NO. Two hoses, two taps, never teed. Closed only when that inducer speed is making the collector setpoint.

   If fail: Replace the open switch only after the vent and trap are proven.

   If pass: Switch closes on draft and the code stays → IFC input.

A limit opened. Both blowers typically run until it recloses. Airflow or overfire — not a charge problem. Rollout is still a manual-reset hazard.

1. 1 Treat this as flame outside the exchanger

   Do not reset the Amana ARVT80 rollout and walk away. Write the code, kill the call, and look for flame at the burners, crossover, and vestibule before you do anything else.

   Expect: No flame outside the exchanger. Burners seated. Crossover lit.

   If pass: Still inspect secondary / flue / condensate before you reset.

2. 2 Secondary, condensate, and flue

   Blocked secondary, drowned collector, or a plugged flue pushes flame out the front. Pull the inducer/collector look, confirm the trap is flowing, and check PVC/vent. IFC heat CFM setting, not a 9-speed tap. Filter, blower wheel, A-coil, return size, total external static.

   Expect: Dry collector, open flue, trap clear.

3. 3 Reset only after the cause is fixed

   Manual-reset rollout. Recurring rollout on Amana ARVT80 is a CO / fire call — cracked primary, misaligned burners, or a failed secondary. Confirm CO in the space before you leave. Manifold pressure on low and high vs rating plate.

   Expect: One clean cycle after the cause is fixed. No second reset as a repair.

Rod sees flame with both solenoids de-energized. Control runs circulator and inducer and will not fire again.

1. 1 Shut the gas cock first

   On Amana ARVT80 the rod sees flame with the valve de-energized. Shut the cock. If flame stays, the valve is leaking — replace it. Do not jump or energize it as a test. Shut the gas cock. If flame stays, leaking valve — replace, do not jump.

   Expect: Flame dies when the cock is shut.

   If fail: Leaking valve. Replace. Do not leave the unit.

2. 2 Rod and IFC flame circuit

   If flame dies with the cock shut, the rod is shorted to ground or the IFC flame circuit is lying. Unplug the rod, inspect ceramic, and check the harness for a rub-through on the collector. Rod shorted to ground or IFC flame circuit.

   Expect: Rod isolated from ground. IFC does not report flame with the rod unplugged.

3. 3 Confirm valve solenoids are actually off

   Measure 24 VAC at both solenoids after the call drops. A welded IFC relay or a shorted W will keep a solenoid wet and look like ‘unexpected flame.’ Treat as a hazard until the valve is proven closed.

   Expect: 0 VAC at both solenoids after the call. No flame.

Low-voltage fuse on the IFC is open. All furnace operation is inhibited except the error display.

1. 1 Find the 24 V short before you replace the fuse

   On Amana ARVT80 an open IFC fuse is a short on W, Y, G, HUM, EAC, or a data pair landed on 24 V. Unplug the thermostat / data harness first. 24 V short on W, Y, G, humidifier, EAC, or a leftover data pair landed on R/C.

   Expect: Fuse out. 24 V transformer still good. Harness isolated.

2. 2 Replace the fuse with the harness off

   New fuse, harness still off. If it holds, the short is in the field wiring or accessory. Plug one circuit back at a time (W, then Y, then HUM/EAC). Unplug the tstat / data harness and replace the fuse. If it blows again the short is on the board or gas-valve harness.

   Expect: Fuse holds with harness off. Dies when the shorted lead lands.

3. 3 If it blows with the harness off

   Short is on the Amana ARVT80 IFC or the gas-valve harness. Unplug the valve and try once more. Repeat blow with valve unplugged = IFC.

   Expect: Do not keep feeding fuses into a welded valve coil or a burned IFC trace.

Flame is present but the micro-amp signal is below the IFC threshold.

1. 1 Measure µA while it is running

   Do not clean first and guess. Series-µA the rod on Amana ARVT80 during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. Clean rod with a non-scratch pad — not sandpaper.

   Expect: Flame rod: µA per this IFC sticker, not the AR9T96 card. Rising while running is the goal.

2. 2 Rod, ground, then gas

   Clean the rod with a non-scratch pad — not sandpaper. Chassis ground to burner box and IFC (painted screw and missing star washer are classic). Then manifold on the stage that is dropping and confirm LP conversion leftovers. Chassis ground to burner box and IFC.

   Expect: Manifold low / high: Natural ~1.6–1.9 / 3.2–3.5 in. w.c. class — rating plate wins. Clock input if in doubt.

3. 3 Prove it is not a switch opening

   Watch the live Amana ARVT80 display when flame drops. A PS or limit code that appears at the drop means the rod was a victim. Inducer, hose, vent wind, or a limit on a wrong heat tap. Manifold pressure / orifice / LP conversion.

   Expect: µA stable and the live code stays a flame code — then rod/valve/IFC. Otherwise chase the new code.

Igniter is open, not connected, or the IFC failed its ground check on the igniter circuit.

1. 1 Ohms at the igniter, then at the IFC

   On Amana ARVT80 measure cold ohms at the igniter plug, then at the IFC connector. An open at the plug is the element or local harness. Open only at the IFC is the harness rub-through on the collector. Igniter ohms cold (confirm sticker — nitride, not a 80% Norton chart).

   Expect: HSI: Nitride, 120 VAC during warm-up. Cold ohms per sticker.

2. 2 120 VAC during warm-up

   Call for heat and measure 120 VAC at the igniter during the warm-up window. 0 V + good ohms = IFC igniter relay. Voltage + no glow = cracked nitride. 120 VAC to igniter during warm-up.

   Expect: 120 VAC only during warm-up. Visible glow before the valve opens.

3. 3 Do not keep cycling a cracked element

   A cracked nitride can ohm ‘good’ cold and open hot. If ohms and voltage are good and there is no glow, replace the igniter. Confirm polarity/ground (this plate’s polarity code) before you condemn a new igniter. Cracked nitride element. Burner-box ground screw and painted-cabinet star washer.

   Expect: One clean light after a known-good igniter and a proven ground.

High-stage pressure switch is made with the inducer not on high. Furnace runs low only regardless of demand.

1. 1 Unplug the switch with the inducer off

   On Amana ARVT80 this code is the switch made when the inducer is not running. Unplug that switch only. This is Category I metal vent. There is no 96% collector or PVC trap to prime.

   Expect: Code changes when the harness is open.

   If fail: Wrong switch, or the IFC input is shorted.

   If pass: Switch/hose path. Go to step 2.

2. 2 Water in the hose vs a welded switch

   Blow the hose. Water holding residual draft is more common than a welded switch. Confirm the hose is not teed and not routed uphill. Ohm the switch with the hose off. Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

   Expect: Hose empty. Switch opens with no draft.

3. 3 IFC input last

   If the switch ohms open, the hose is dry, and the code does not change with the harness off, the Amana ARVT80 IFC input is shorted. Do not keep swapping switches. This is the second switch — do not confuse with E1.

   Expect: Known-good open switch + open harness = code gone. If not, IFC.

Inducer on high, high-stage switch never closes. Classic ‘runs on low, will not go high.’

1. 1 Prove inducer and the live code

   Do not pull power — that clears the Amana ARVT80 active code. Write E9. Is the inducer spinning on this call? Silent inducer is not a pressure switch. This is Category I metal vent. There is no 96% collector or PVC trap to prime.

   Expect: 120 VAC at the inducer on a heat call. Wheel turning.

   If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.

   If pass: Inducer running + this code → trap, hose, switch, vent (step 2).

2. 2 Trap, collector, and the hose

   A drowned 96% trap will not make collector pressure. Pull the trap, flush it, confirm the collector box and inducer outlet are not full. Hose cracked, off the port, or full of water fakes an open switch. Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

   Expect: Trap flowing, hose dry and downhill, ports not swapped on a two-switch board.

3. 3 Switch ohms, then vent load

   Ohm the pressure switch: NO, must close when that inducer speed is making the collector setpoint. If the switch is good, walk the PVC — bird screen, ice, long 2" run, wind, shared chase. Inducer actually changes speed on a high-fire request? Listen / amp it.

   Expect: LPS / HPS: Both NO. Two hoses, two taps, never teed. Closed only when that inducer speed is making the collector setpoint.

   If fail: Replace the open switch only after the vent and trap are proven.

   If pass: Switch closes on draft and the code stays → IFC input.

L1/N reversed or chassis ground missing. HSI and flame sense both suffer. Furnace will not operate.

1. 1 Measure µA while it is running

   Do not clean first and guess. Series-µA the rod on Amana ARVT80 during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. Hot and neutral at the IFC, not just the disconnect.

   Expect: Flame rod: µA per this IFC sticker, not the AR9T96 card. Rising while running is the goal.

2. 2 Rod, ground, then gas

   Clean the rod with a non-scratch pad — not sandpaper. Chassis ground to burner box and IFC (painted screw and missing star washer are classic). Then manifold on the stage that is dropping and confirm LP conversion leftovers. Burner box to IFC ground screw.

   Expect: Manifold low / high: Natural ~1.6–1.9 / 3.2–3.5 in. w.c. class — rating plate wins. Clock input if in doubt.

3. 3 Prove it is not a switch opening

   Watch the live Amana ARVT80 display when flame drops. A PS or limit code that appears at the drop means the rod was a victim. Inducer, hose, vent wind, or a limit on a wrong heat tap. 24V transformer leads swapped on a replacement IFC.

   Expect: µA stable and the live code stays a flame code — then rod/valve/IFC. Otherwise chase the new code.

No line voltage reaching the IFC, door switch open, or an internal control condition. This is power, not a ComfortBridge data-pair code.

1. 1 Measure at the IFC under load

   On Amana ARVT80 line-voltage codes are incoming power. Measure L1/L2 (or L1/N) at the board while it is trying to run, not just at the disconnect. Furnace switch, breaker, and blower-door switch fully made.

   Expect: Voltage in the rating-plate window under load.

2. 2 Drop, breaker, and the whip

   Large drop from the disconnect to the IFC is a loose lug or damaged whip. Breaker that will not hold under inducer/blower start is the circuit, not the board. 115 VAC at L1/N on the IFC.

   Expect: Minimal drop. Tight lugs. Correct breaker size.

3. 3 Transformer 24 V last

   If line is good and 24 V is low, load the transformer (stat + valve + accessories). A collapsing 24 V looks like a comm or fuse call. Do not confuse EE on this board with a comms complaint — check the data pair separately if the stat is dark and the IFC is alive.

   Expect: 24 V holds under load. Line stays in window.

IFC commanded the serial ECM and does not detect it running. Furnace will not operate.

1. 1 Reseat the serial plug

   On Amana ARVT80 this is a communicating / serial ECM, not a tap motor. Kill power, reseat the 14-pin (or OEM serial plug) at the motor and at the IFC. Pins straight, no corrosion. 14-pin harness seated at motor and IFC. No tap plugs on this motor.

   Expect: Plug fully seated both ends. Correct motor for this cabinet.

2. 2 Power and the data pair at the motor

   Line voltage at the motor, then the serial/data pair continuity. A half-seated plug or a pinched harness throws comm on a good motor. 120 VAC to the motor, wheel free, no wet winding.

   Expect: Line voltage present. Data pair not shorted to chassis.

3. 3 Motor vs IFC serial driver

   Known-good motor still throws this code = Amana ARVT80 IFC serial driver. Known-good IFC still throws it = motor module. Do not put a PSC or 9-speed tap motor on a serial IFC. Do not install an AR9T96 9-speed motor as a ‘cheaper ECM’ — it will not talk this serial bus.

   Expect: One clean CFM request after a known-good pair.

IFC cannot communicate with the variable-speed blower. Furnace will not operate.

1. 1 Reseat the serial plug

   On Amana ARVT80 this is a communicating / serial ECM, not a tap motor. Kill power, reseat the 14-pin (or OEM serial plug) at the motor and at the IFC. Pins straight, no corrosion. Same 14-pin harness — pins bent, corrosion, half-seated.

   Expect: Plug fully seated both ends. Correct motor for this cabinet.

2. 2 Power and the data pair at the motor

   Line voltage at the motor, then the serial/data pair continuity. A half-seated plug or a pinched harness throws comm on a good motor. Motor vs IFC: if a known-good motor still b1s, the IFC serial driver is the fault.

   Expect: Line voltage present. Data pair not shorted to chassis.

3. 3 Motor vs IFC serial driver

   Known-good motor still throws this code = Amana ARVT80 IFC serial driver. Known-good IFC still throws it = motor module. Do not put a PSC or 9-speed tap motor on a serial IFC. Power-cycle once to see if it is a hard loss or a glitch after a static event.

   Expect: One clean CFM request after a known-good pair.

Connected motor horsepower does not match the value in the furnace shared-data set. Furnace will not operate.

1. 1 Read the plug / card on THIS cabinet

   On Amana ARVT80 the model plug or shared-data card must match this cabinet size. A 100 kBtu plug in an 80 cabinet overfires and limits. A leftover memory card after a control swap throws d0/d4-class codes. Wrong replacement motor for this cabinet size.

   Expect: Plug / card part matches the rating plate and the replacement control bulletin.

2. 2 Reseat, then confirm the menu

   Kill power, reseat, restore power. On communicating plates open the setup and confirm unit size / motor HP. Wrong memory card after an IFC swap (see d0/d4).

   Expect: IFC recognizes the plug. No size-mismatch code.

3. 3 Do not run it mismatched

   A wrong plug is not a ‘temporary’ fix. It will throw limit, ignition, or blower-band codes that look like bad parts. Fit the correct plug, then re-run the original complaint. Do not ‘make it work’ with a different HP ECM — ComfortBridge CFM tables are card-specific.

   Expect: One clean sequence on the correct identity.

ECM is folding back on power, speed, or temperature. Furnace keeps running at reduced CFM.

1. 1 Airflow before you touch the limit

   On Amana ARVT80 a limit is airflow or overfire until proven otherwise. Do not replace the limit first. Filter, blower wheel, A-coil, and the heat-speed setting for THIS motor (tap, model plug, or communicating CFM — not a sister SKU chart). This is Category I metal vent. There is no 96% collector or PVC trap to prime.

   Expect: Rise in the rating-plate window. Static vs this cabinet’s blower chart.

2. 2 Measure static and temperature rise

   Total external static vs the Amana ARVT80 blower chart for this cabinet size. Supply minus return rise after 8–10 minutes. A new 5" media cabinet or closed supplies will trip this all winter. Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

   Expect: Rise typically 35–65 °F — rating plate wins.

   If fail: Fix the restriction or the heat-speed setting. The limit is doing its job.

   If pass: Airflow in range → step 3 (overfire / limit itself).

3. 3 Overfire, then the limit circuit

   Clock the meter / manifold on the stage that is tripping vs the rating plate. Then ohm the limit after it cools — a limit that never recloses is failed. Rollout in the same circuit is a different call (see rollout on this door card). Filter, coil, and total external static vs the AMVC96 blower chart.

   Expect: Manifold low / high: Natural ~1.6–1.9 / 3.2–3.5 in. w.c. class — rating plate wins. Clock input if in doubt.

b4 = lost rotor or overload trip (shuts down and retries). b5 = locked rotor after 10 start attempts. b7 = motor parameters missing or failed to start after 40 attempts.

1. 1 Is the wheel free?

   Spin the Amana ARVT80 blower by hand. Ice, debris, or a seized bearing is not a control problem. Confirm the motor type on this plate — serial ECM, 9-speed tap, or X-13 — before you grab a capacitor. Wheel rub, debris in the housing, seized bearings.

   Expect: Wheel free. Correct motor family for this IFC.

2. 2 Command vs rotation

   Call for G or heat and confirm the IFC is actually requesting CFM (taps, serial, or communicating). Amp the motor. Locked rotor + a good command = motor. No command = IFC / harness / shared data. Static so high the motor cannot start the wheel.

   Expect: Command present. Motor amps in range, not locked.

3. 3 Static and the wrong motor

   High static will trip current/limit codes and look like a dead motor. Measure TES vs this cabinet. Wrong horsepower or a leftover memory card after a control swap is the other half of this call. Harness intermittents look like b7. Prove the 14-pin before a motor or IFC.

   Expect: Static on the blower chart. Matching motor / shared-data card.

Indoor airflow fell below the calculated minimum. Furnace stages down (high to low) and will halt if CFM reaches 0.

1. 1 Is the wheel free?

   Spin the Amana ARVT80 blower by hand. Ice, debris, or a seized bearing is not a control problem. Confirm the motor type on this plate — serial ECM, 9-speed tap, or X-13 — before you grab a capacitor. Filter, coil, closed registers, undersized return.

   Expect: Wheel free. Correct motor family for this IFC.

2. 2 Command vs rotation

   Call for G or heat and confirm the IFC is actually requesting CFM (taps, serial, or communicating). Amp the motor. Locked rotor + a good command = motor. No command = IFC / harness / shared data. IFC heat/cool CFM setting vs the coil and the outdoor.

   Expect: Command present. Motor amps in range, not locked.

3. 3 Static and the wrong motor

   High static will trip current/limit codes and look like a dead motor. Measure TES vs this cabinet. Wrong horsepower or a leftover memory card after a control swap is the other half of this call. TES. A communicating motor will ramp into a brick and then b9 / E3.

   Expect: Static on the blower chart. Matching motor / shared-data card.

d0 = IFC has no shared-data set (replacement board, missing card) and cannot drive the serial ECM or calculate CFM. d4 = card rejected (wrong model card).

1. 1 Read the plug / card on THIS cabinet

   On Amana ARVT80 the model plug or shared-data card must match this cabinet size. A 100 kBtu plug in an 80 cabinet overfires and limits. A leftover memory card after a control swap throws d0/d4-class codes. After an IFC swap the AMVC96 memory card must be installed and seated.

   Expect: Plug / card part matches the rating plate and the replacement control bulletin.

2. 2 Reseat, then confirm the menu

   Kill power, reseat, restore power. On communicating plates open the setup and confirm unit size / motor HP. A GMVC96 card usually twins; an AMVM97, AVPTC, or AR9T96 card is d4.

   Expect: IFC recognizes the plug. No size-mismatch code.

3. 3 Do not run it mismatched

   A wrong plug is not a ‘temporary’ fix. It will throw limit, ignition, or blower-band codes that look like bad parts. Fit the correct plug, then re-run the original complaint. Do not run the furnace on empty shared data and guess CFM.

   Expect: One clean sequence on the correct identity.