Trane
CO2 ERR
ProtectCO2 SENS ERR (JADE LCD example)
JADE LCD: CO2 / SENS ERR. DCV sensor failed or the 0–10 V input is floating. Damper holds open; compressor never runs.
Walk CO2 ERR in Diagnose
2 plates — walk the one on the cabinet
First check
1 Damper position vs command
On Trane YHC look at the economizer before the compressor. Commanded open? Blade actually open? Linkage off the shaft is a rooftop weekly. Read CO2 in an empty space. 400–800 ppm typical empty retail. 2000 ppm empty is a failed sensor.
Expect: Blade matches the module command. Stuck open = overventilation. Stuck closed = no free cooling.
The rest of the walkthrough is Diagnose.
On the plates
- Read CO2 in an empty space. 400–800 ppm typical empty retail. 2000 ppm empty is a failed sensor.
- 0–10 V at the DCV input vs the sensor. If DCV is unused, set the input OFF on JADE.
Plates that use CO2 ERR
Same number, other makers
CO2 ERR on Trane is not the same code on these plates.
- Bryant CO2 ERRCO2 SENS ERR (JADE LCD example)
- Carrier CO2 ERRCO2 SENS ERR (JADE LCD example)
- Goodman CO2 ERRCO2 SENS ERR (JADE LCD example)
- ICP CO2 ERRCO2 SENS ERR (JADE LCD example)
- Lennox CO2 ERRCO2 SENS ERR (JADE LCD example)
- Rheem CO2 ERRCO2 SENS ERR (JADE LCD example)
- York CO2 ERRCO2 SENS ERR (JADE LCD example)