TM9V

IFC powered, idle. Not a fault.

1. 1 Confirm this is not a fault

   On the York TM9V this readout (Slow green) 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 York TM9V 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: If the house is cold, the call never reached W. Check R/W at the IFC, door switch, and the thermostat.

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

3. 3 Watch one full sequence

   Leave power on. Watch JCI / Coleman-York IFC · green / amber / red LED through one cycle and write the first real fault that replaces this status word.

   Expect: W1: Limits/rollout proved closed. Inducer starts on low. Low-fire PS must close (3-red if it never does; 2-red if it was already closed with the inducer off).

IFC sees W and is running or sequencing a heat cycle.

1. 1 Confirm this is not a fault

   On the York TM9V this readout (Slow amber) 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 York TM9V 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: If burners are out while amber is slow, you caught it between trials or the fault has not latched yet. Stay and watch.

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

3. 3 Watch one full sequence

   Leave power on. Watch JCI / Coleman-York IFC · green / amber / red LED through one cycle and write the first real fault that replaces this status word.

   Expect: W1: Limits/rollout proved closed. Inducer starts on low. Low-fire PS must close (3-red if it never does; 2-red if it was already closed with the inducer off).

TWIN circuit miswired or 24 V phasing between twinned IFCs is wrong.

1. 1 Is this cabinet actually twinned?

   On a standalone York TM9V, nothing belongs on the TWIN terminal. A leftover jumper throws this. Standalone TM9V: nothing belongs on the TWIN terminal.

   Expect: TWIN empty on a single cabinet.

2. 2 Twinned pair must be the same IFC family

   Twinned units must be the same family and IFC revision. Mixing this plate with a communicating sister SKU will not twin. Twinned pair must be the same JCI family / same IFC revision. Check 24 V phasing per the twinning kit.

   Expect: Same model family, same IFC, kit installed per the twinning sheet.

3. 3 Phasing and 24 V

   Twinning errors that survive a correct kit are 24 V phasing or a broken twin lead. Measure both cabinets before you change an IFC.

   Expect: In-phase 24 V. Continuous twin lead.

Flame is present but current is below the warning threshold. Normal on this IFC is ~3.7 µA DC. Lockout territory is < 0.1 µA.

1. 1 Measure µA while it is running

   Do not clean first and guess. Series-µA the rod on York TM9V 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. Read µA at the IFC flame-sense test pad during a run.

   Expect: Flame sense: Normal ~3.7 µA DC at the IFC test pad. Warning (rapid amber) < 1.5 µA. Lockout < 0.1 µA.

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. Clean the rod with a non-scratch pad — not sandpaper.

   Expect: Manifold on the rating plate. Solid burner-box ground.

3. 3 Prove it is not a switch opening

   Watch the live York TM9V 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. Chassis ground to burner box and IFC. Reversed polarity will also show as 9-red.

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

Thermostat is presenting Y and not G. IFC will not assume a fan call the way some 80% boards do.

1. 1 Is the wheel free?

   Spin the York TM9V 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. Stat wiring: Y and G both need to make on a cool call, or use a stat that ties them.

   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. A cooling-only miswire here is not a pressure-switch problem.

   Expect: Heat CFM: IFC VS menu matched to the rise range on the rating plate. Not TM9T taps.

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.

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

Rod sees flame with the gas valve de-energized.

1. 1 Shut the gas cock first

   On York TM9V 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 hazard until the valve is proven closed.

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

A PS is made with the inducer off.

1. 1 Unplug the switch with the inducer off

   On York TM9V this code is the switch made when the inducer is not running. Unplug that switch only. Unplug that switch. If the code changes, the switch is welded or the hose is holding residual draft / water.

   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. Two-stage: identify which switch (low vs high tap). Do not tee them.

   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 York TM9V IFC input is shorted. Do not keep swapping switches. IFC input shorted — only after the switch ohms open.

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

Inducer is running and the prove switch will not close. On this 96% that is almost always trap / collector / PVC, not a bad switch.

1. 1 Prove inducer and the live code

   Do not pull power — that clears the York TM9V active code. Write 3 red. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Inducer spinning? 120 VAC at the inducer on the call.

   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. Dump the condensate trap and open the collector. TM9V 96% will not make pressure with a full trap.

   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. PVC intake/exhaust — bird screen, ice, long run, wind, slope back to the collector.

   Expect: LPS / HPS: Two NO switches, two hoses, two ports. 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.

Primary limit (and on some boards the 24 V fuse path) is open. Airflow or overfire — not a charge problem.

1. 1 Airflow before you touch the limit

   On York TM9V 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 TM9V: heat CFM lives in the VS menu. Do not look for TM9T taps.

   Expect: Heat CFM: IFC VS menu matched to the rise range on the rating plate. Not TM9T taps.

2. 2 Measure static and temperature rise

   Total external static vs the York TM9V 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. Filter, blower wheel, A-coil, return size, total external static vs the TM9V blower chart.

   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). Also check the automotive fuse on the IFC — 4-red on this family includes an open board fuse.

   Expect: Manifold on plate. Limit closed when cool.

Manual-reset rollout opened. Treat as flame outside the exchanger until proven otherwise.

1. 1 Treat this as flame outside the exchanger

   Do not reset the York TM9V 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. Primary exchanger cracks, burner alignment, crossover. Blocked secondary / condensate / flue.

   Expect: Dry collector, open flue, trap clear.

3. 3 Reset only after the cause is fixed

   Manual-reset rollout. Recurring rollout on York TM9V is a CO / fire call — cracked primary, misaligned burners, or a failed secondary. Confirm CO in the space before you leave. Reset only after the cause is fixed. Recurring 5-red is a CO / fire call.

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

Draft proved, then dropped four times on this W. One-hour lockout, then retry.

1. 1 Prove inducer and the live code

   Do not pull power — that clears the York TM9V active code. Write 6 red. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Same physics as 3-red — trap, hose, vent, wind — but intermittent. Watch a full call; do not just ohm a cold switch.

   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. Condensate backing into the collector only after several minutes.

   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. High-fire only? Then the high-fire hose / vent capacity is the path.

   Expect: LPS / HPS: Two NO switches, two hoses, two ports. 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.

Three ignition trials without prove. One-hour-class lockout.

1. 1 Watch one full try — do not reset

   Write the York TM9V 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: W1 → HSI / trial → Blower → W2 / high fire → Flame / limits → 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). Gas cock, LP tank, meter lock.

   Expect: Inlet and manifold on the plate. 24 VAC only during trial.

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. Igniter 120 VAC and ohms. Open circuit is 12-red — if you have 7-red the igniter usually glowed.

   Expect: Flame sense: Normal ~3.7 µA DC at the IFC test pad. Warning (rapid amber) < 1.5 µA. Lockout < 0.1 µA.

Flame proved, then dropped five times on this cycle.

1. 1 Measure µA while it is running

   Do not clean first and guess. Series-µA the rod on York TM9V 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. µA while running — want ~3.7 µA, warning <1.5, drop-out <0.1.

   Expect: Flame sense: Normal ~3.7 µA DC at the IFC test pad. Warning (rapid amber) < 1.5 µA. Lockout < 0.1 µA.

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. Gas pressure sag when other appliances fire. Valve that will not hold.

   Expect: Manifold on the rating plate. Solid burner-box ground.

3. 3 Prove it is not a switch opening

   Watch the live York TM9V 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. Draft that collapses when the blower comes on (limit/PS cluster).

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

L1/N reversed or chassis ground missing. HSI and flame sense both suffer.

1. 1 Measure µA while it is running

   Do not clean first and guess. Series-µA the rod on York TM9V 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 sense: Normal ~3.7 µA DC at the IFC test pad. Warning (rapid amber) < 1.5 µA. Lockout < 0.1 µA.

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. Painted screw, missing star washer.

   Expect: Manifold on the rating plate. Solid burner-box ground.

3. 3 Prove it is not a switch opening

   Watch the live York TM9V 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. Flame probe not shorted to chassis.

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

Same family as 1-red on later JCI revisions — flame with valve off.

1. 1 Shut the gas cock first

   On York TM9V 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. Read the door card on THIS IFC. 1-red vs 10-red is a revision split, not two different physics.

   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. Gas valve leak / slow close. Shut the cock.

   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.’ Replace the IFC only after the valve and rod are proven.

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

Limit stayed open long enough that the IFC assumes the blower never moved air.

1. 1 Airflow before you touch the limit

   On York TM9V 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). Blower actually running on the heat call? VS motor harness and IFC CFM setting.

   Expect: Heat CFM: IFC VS menu matched to the rise range on the rating plate. Not TM9T taps.

2. 2 Measure static and temperature rise

   Total external static vs the York TM9V 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. Wheel off the shaft, seized motor, or a door-switch/fuse that killed the motor while the limit was open.

   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). Cycle 24 VAC only after airflow is restored. Repeating 11-red is not a bad limit.

   Expect: Manifold on plate. Limit closed when cool.

IFC measured an open HSI path before or during trial.

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

   On York TM9V 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. Ohms at the igniter plug, then at the IFC. Cracked nitride is common.

   Expect: Nitride cold ohms per THIS door sticker — do not use an 80% Norton chart.

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. Harness rub-through on the collector.

   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. Loose/disconnected igniter plug after a heat-exchanger job.

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

Internal IFC fault. The LED stays on continuously — not a counted flash.

1. 1 Write the live code and watch one cycle

   On York TM9V read JCI / Coleman-York IFC · green / amber / red LED before you pull power. Write Steady red exactly. Watch one full sequence and note which step dies. Confirm it is truly steady, not a fast count you missed.

   Expect: W1: Limits/rollout proved closed. Inducer starts on low. Low-fire PS must close (3-red if it never does; 2-red if it was already closed with the inducer off).

2. 2 Prove the circuit this code names

   120 VAC and 24 VAC present, fuse good, then replace the control. The IFC is not field-repairable.

   Expect: A measured open, short, or out-of-range reading — not a guess.

3. 3 Confirm with a number, then the next part

   If the named part measures good, the IFC input/output or a related code on this same plate is next. Do not apply a sister-SKU chart.

   Expect: Flame sense: Normal ~3.7 µA DC at the IFC test pad. Warning (rapid amber) < 1.5 µA. Lockout < 0.1 µA.