AERCO (Watts) · Error codes
AERCO (Watts) error codes and alerts
Identical code numbers can mean different things on different controllers, so every entry is tied to the documented series, controller and manual version. A code is never a diagnosis.
If you smell gas
- Stop what you are doing. Do not use phones, switches, matches or anything that can spark inside.
- Go outside and leave the door open behind you.
- Call the FortisBC 24-hour emergency line at 1-800-663-9911 or dial 911.
Only after that, call ROMA about the boiler. Official guidance: FortisBC gas leaks and odour.
AERCO Benchmark 750-3000 condensing boilers (C-More fault messages, OMM-0122 Table B-2)
AIRFLOW FAULT DURING PURGE
The Blower Proof switch opened during purge, or air inlet is blocked. The table classifies it as Fault message.…
Details
AIRFLOW FAULT DURING IGN
The Blower Proof switch opened during ignition. The table classifies it as Fault message.…
Lockout
AIRFLOW FAULT DURING RUN
The Blower Proof switch opened during run. The table classifies it as Fault message.…
Details
DELAYED INTERLOCK OPEN
The Delayed Interlock is open. The table classifies it as Fault message.…
Details
DIRECT DRIVE SIGNAL FAULT
The direct drive signal is not present or is out of range. The table classifies it as Fault message.…
Details
FFWD TEMP SENSOR FAULT
The temperature measured by the Feed Forward (FFWD) Sensor is out of range. The table classifies it as Fault message.…
Details
FLAME LOSS DURING IGN
The Flame signal was not seen during ignition or lost within 5 seconds after ignition. The table classifies it as Fault message.…
Lockout
FLAME LOSS DURING RUN
The Flame signal was lost during run. The table classifies it as Fault message.…
Lockout
HEAT DEMAND FAILURE
The Heat Demand Relays on the Ignition board failed to activate when commanded. The table classifies it as Fault message.…
Lockout
HIGH EXHAUST TEMPERATURE
The Exhaust Temperature has exceeded 200°F (93.3°C). The table classifies it as Fault message.…
Details
GAS PRESSURE FAULT
The High Gas Pressure Limit switch is open or the Low Gas Pressure Limit switch is open. The table classifies it as Fault message.…
Details
HIGH WATER TEMPERATURE
The temperature measured by the Outlet Sensor exceeded the Temp Hi Limit setting. The table classifies it as Fault message.…
Details
HIGH WATER TEMP SWITCH OPEN
The High Water Temperature Limit switch is open. The table classifies it as Fault message.…
Details
IGN BOARD COMM FAULT
A communication fault has occurred between the PMC board and Ignition board. The table classifies it as Fault message.…
Lockout
IGN SWTCH CLOSED DURING PURGE
The Ignition Position Limit switch on the Air/Fuel Valve closed during purge. The table classifies it as Fault message.…
Lockout
IGN SWTCH OPEN DURING IGNITION
The Ignition Position Limit switch on the Air/Fuel Valve opened during ignition. The table classifies it as Fault message.…
Lockout
INTERLOCK OPEN
The Remote Interlock is open. The table classifies it as Fault message.…
Details
LINE VOLTAGE OUT OF PHASE
The Line (Hot) and Neutral wires are reversed. The table classifies it as Fault message.…
Details
LOW WATER LEVEL
The Low Water Cutoff board is indicating low water level. The table classifies it as Fault message.…
Details
NETWORK COMM FAULT
The RS-485 network information is not present or is corrupted. The table classifies it as Fault message.…
Details
O2 % OUT OF RANGE
The O2 % has gone below 3% or above 8%. The table classifies it as Fault message.…
Details
OUTDOOR TEMP SENSOR FAULT
The temperature measured by the Outdoor Air Sensor is out of range. The table classifies it as Fault message.…
Details
OUTLET TEMP SENSOR FAULT
The temperature measured by the Outlet Sensor is out of range: • OUTLET TEMPERATURE display = SHt indicates sensor is shorted • OUTLET TEMPE…
Details
PRG SWTCH CLOSED DURING IGNITION
The Purge Position Limit switch on the Air/Fuel Valve closed during ignition. The table classifies it as Fault message.…
Lockout
PRG SWTCH OPEN DURING PURGE
The Purge Position Limit switch on the Air/Fuel Valve opened during purge. The table classifies it as Fault message.…
Details
REMOTE SETPT SIGNAL FAULT
The Remote Setpoint signal is not present or is out of range. The table classifies it as Fault message.…
Details
RESIDUAL FLAME
The Flame signal was seen for more than 60 seconds during standby. The table classifies it as Fault message.…
Lockout
SSOV SWITCH OPEN
The SSOV switch opened during standby. The table classifies it as Fault message.…
Details
SSOV FAULT DURING PURGE
The SSOV switch opened dug purge. The table classifies it as Fault message.…
Details
SSOV FAULT DURING IGN
The SSOV switch closed or failed to open during ignition. The table classifies it as Fault message.…
Lockout
SSOV FAULT DURING RUN
The SSOV switch closed for more than 15 seconds during run. The table classifies it as Fault message.…
Details
SSOV RELAY FAILURE
A failure has been detected in one of the relays that control the SSOV. The table classifies it as Fault message.…
Details
STEPPER MOTOR FAILURE
The Stepper Motor failed to move the Air/Fuel Valve to the desired position. The table classifies it as Fault message.…
Details
AERCO Innovation condensing boilers and water heaters (C-More fault messages, OMM-0078 Table B-2)
AIRFLOW FAULT DURING PURGE
The Blower Proof switch opened during purge, or air inlet is blocked. The table classifies it as Fault message.…
Details
AIRFLOW FAULT DURING IGN
The Blower Proof switch opened during ignition. The table classifies it as Fault message.…
Lockout
AIRFLOW FAULT DURING RUN
The Blower Proof switch opened during run. The table classifies it as Fault message.…
Details
DELAYED INTERLOCK OPEN
The Delayed Interlock is open. The table classifies it as Fault message.…
Details
DIRECT DRIVE SIGNAL FAULT
The direct drive signal is not present or is out of range. The table classifies it as Fault message.…
Details
FFWD TEMP SENSOR FAULT
The temperature measured by the Feed Forward (FFWD) Sensor is out of range. The table classifies it as Fault message.…
Details
FLAME LOSS DURING IGN
The Flame signal was not seen during ignition or lost within 5 seconds after ignition. The table classifies it as Fault message.…
Lockout
FLAME LOSS DURING RUN
The Flame signal was lost during run. The table classifies it as Fault message.…
Lockout
HEAT DEMAND FAILURE
The Heat Demand Relays on the Ignition board failed to activate when commanded. The table classifies it as Fault message.…
Lockout
HIGH EXHAUST TEMPERATURE
The High Exhaust Temperature Limit switch is closed. The table classifies it as Fault message.…
Details
GAS PRESSURE FAULT
The High Gas Pressure Limit switch OR Low Gas Pressure Limit switch is open. The table classifies it as Fault message.…
Details
HIGH WATER TEMPERATURE
The temperature measured by the Outlet Sensor exceeded the Temp Hi Limit setting. The table classifies it as Fault message.…
Details
HIGH WATER TEMP SWITCH OPEN
The High Water Temperature Limit switch is open. The table classifies it as Fault message.…
Details
IGN BOARD COMM FAULT
A communication fault has occurred between the PMC board and Ignition board. The table classifies it as Fault message.…
Lockout
IGN SWITCH CLOSED DURING PURGE
The Ignition Position Limit switch on the Air/Fuel Valve closed during purge. The table classifies it as Fault message.…
Lockout
IGN SWITCH OPEN DURING IGNITION
The Ignition Position Limit switch on the Air/Fuel Valve opened during ignition. The table classifies it as Fault message.…
Lockout
INTERLOCK OPEN
The Remote Interlock is open. The table classifies it as Fault message.…
Details
LINE VOLTAGE OUT OF PHASE
The Line (Hot) and Neutral wires are reversed. The table classifies it as Fault message.…
Details
LOW WATER LEVEL
The Low Water Cutoff board is indicating low water level. The table classifies it as Fault message.…
Details
NETWORK COMM FAULT
The RS-485 network information is not present or is corrupted. The table classifies it as Fault message.…
Details
OUTDOOR TEMP SENSOR FAULT
The temperature measured by the Outdoor Air Sensor is out of range. The table classifies it as Fault message.…
Details
OUTLET TEMP SENSOR FAULT
The temperature measured by the Outlet Sensor is out of range: OUTLET TEMPERATURE display = SHt Indicates sensor is shorted OUTLET TEMPERATU…
Details
PRG SWITCH CLOSED DURING IGNITION
The Purge Position Limit switch on the Air/Fuel Valve closed during ignition. The table classifies it as Fault message.…
Lockout
PRG SWITCH OPEN DURING PURGE
The Purge Position Limit switch on the Air/Fuel Valve opened during purge. The table classifies it as Fault message.…
Details
RECIRC PUMP FAILURE
Internal Recirculation Pump has failed. The table classifies it as Fault message.…
Details
REMOTE SETPT SIGNAL FAULT
The Remote Setpoint signal is not present or is out of range. The table classifies it as Fault message.…
Details
RESIDUAL FLAME
The Flame signal was seen for more than 60 seconds during standby. The table classifies it as Fault message.…
Lockout
SSOV SWITCH OPEN
The SSOV switch opened during standby. The table classifies it as Fault message.…
Details
SSOV FAULT DURING PURGE
The SSOV switch opened during purge. The table classifies it as Fault message.…
Details
SSOV FAULT DURING IGN
The SSOV switch closed or failed to open during ignition. The table classifies it as Fault message.…
Lockout
SSOV FAULT DURING RUN
The SSOV switch closed for more than 15 seconds during Run. The table classifies it as Fault message.…
Details
SSOV RELAY FAILURE
A failure has been detected in one of the relays that control the SSOV. The table classifies it as Fault message.…
Details
STEPPER MOTOR FAILURE
The Stepper Motor failed to move the Air/Fuel Valve to the desired position. The table classifies it as Fault message.…
Details
WARNING EXHAUST TEMP HIGH (Flashing)
The exhaust gas sensor is measuring high temperature. Level #1: 180ºF (82.2°C), Flash WARNING Level #2: 190ºF (87.8°C), Govern fire rate/fla…
Details
Talk to a boiler technician
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.