APPENDIX B
B-2
FAULT MESSAGES
HIGH WATER TEMP
SWITCH OPEN
The High Water Temperature Limit Switch is open.
The Water Level Control board is indicating low water level.
The Low Gas Pressure Limit Switch is open.
The High Gas Pressure Limit Switch is open.
The Remote Interlock is open.
The Delayed Interlock is open.
AIRFLOW FAULT
The Blower Proof Switch opened during purge.
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.
The Blower Proof Switch opened during ignition.
The Blower Proof Switch opened during run.
The SSOV switch opened during standby.
The SSOV switch opened during purge.
The SSOV switch closed or failed to open during ignition.
The SSOV switch closed for more than 15 seconds during
run.
A failure has been detected in one of the relays that control
the SSOV.
The Flame signal was not seen during ignition or lost within 5
seconds after ignition.
The Flame signal was lost during run.
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.
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