Troubleshooting guide

APPENDIX B
B-2
TABLE B-2. FAULT MESSAGES
FAULT MESSAGE FAULT DESCRIPTION
HIGH WATER TEMP
SWITCH OPEN
The High Water Temperature Limit Switch is open.
LOW WATER
LEVEL
The Water Level Control board is indicating low water level.
LOW GAS
PRESSURE
The Low Gas Pressure Limit Switch is open.
HIGH GAS
PRESSURE
The High Gas Pressure Limit Switch is open.
INTERLOCK
OPEN
The Remote Interlock is open.
DELAYED
INTERLOCK OPEN
The Delayed Interlock is open.
AIRFLOW FAULT
DURING PURGE
The Blower Proof Switch opened during purge,
or air inlet is blocked.
PRG SWTCH OPEN
DURING PURGE
The Purge Position Limit switch on the air/fuel valve opened
during purge.
IGN SWTCH OPEN
DURING IGNITION
The Ignition Position Limit switch on the air/fuel valve opened
during ignition.
IGN SWTCH CLOSED
DURING PURGE
The Ignition Position Limit switch on the air/fuel valve closed
during purge.
PRG SWTCH CLOSED
DURING IGNITION
The Purge Position Limit switch on the air/fuel valve closed
during ignition.
AIRFLOW FAULT
DURING IGN
The Blower Proof Switch opened during ignition.
AIRFLOW FAULT
DURING RUN
The Blower Proof Switch opened during run.
SSOV
SWITCH OPEN
The SSOV switch opened during standby.
SSOV FAULT
DURING PURGE
The SSOV switch opened during purge.
SSOV FAULT
DURING IGN
The SSOV switch closed or failed to open during ignition.
SSOV FAULT
DURING RUN
The SSOV switch closed for more than 15 seconds during
run.
SSOV RELAY
FAILURE
A failure has been detected in one of the relays that control
the SSOV.
FLAME LOSS
DURING IGN
The Flame signal was not seen during ignition or lost within 5
seconds after ignition.
FLAME LOSS
DURING RUN
The Flame signal was lost during run.
HIGH EXHAUST
TEMPERATURE
The High Exhaust Temperature Limit Switch is closed.
LOSS OF POWER A power loss had occurred. The time and date when power
was restored is displayed.