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Benchmark 5000-6000 Operation & Maintenance Manual
APPENDIX B – STARTUP, STATUS, AND DISPLAY MESSAGES
Appendix B2: Fault Messages
TABLE B-2: Fault Messages
Fault Message
AIRFLOW FAULT
DURING PURGE
AIRFLOW FAULT
DURING IGN
AIRFLOW FAULT
DURING RUN
DELAYED
INTERLOCK OPEN
DIRECT DRIVE
SIGNAL FAULT
FFWD TEMP
SENSOR FAULT
FLAME LOSS
DURING IGN
FLAME LOSS
DURING RUN
HEAT DEMAND
FAILURE
HIGH EXHAUST
TEMPERATURE
GAS PRESSURE
FAULT
HIGH WATER
TEMPERATURE
HIGH WATER TEMP
SWITCH OPEN
IGN BOARD
COMM FAULT
IGN SWTCH CLOSED
DURING PURGE
IGN SWTCH OPEN
DURING IGNITION
INTERLOCK
OPEN
LINE VOLTAGE
OUT OF PHASE
OMM-0118_B • GF-203 • 5/9/2019
The Blower Proof switch opened during purge,
or air inlet is blocked.
The Blower Proof switch opened during ignition.
The Blower Proof switch opened during run.
The Delayed Interlock is open.
The direct drive signal is not present or is out of range.
The temperature measured by the Feed Forward (FFWD) Sensor
is out of range.
The Flame signal was not seen during ignition or lost within 5
seconds after ignition.
The Flame signal was lost during run.
The Heat Demand Relays on the Ignition board failed to activate
when commanded.
The Exhaust Temperature has exceeded 200°F (93.3
The High Gas Pressure Limit switch is open or the Low Gas
Pressure Limit switch is open.
The temperature measured by the Outlet Sensor exceeded the
Temp Hi Limit setting.
The High Water Temperature Limit switch is open, or the VFD is in
"Local" mode or voltage to the unit dropped below threshold or the
Surface Temp sensor is open.
A communication fault has occurred between the PMC board and
Ignition board.
The Ignition Position Limit switch on the Air/Fuel Valve closed
during purge.
The Ignition Position Limit switch on the Air/Fuel Valve opened
during ignition.
The Remote Interlock is open.
The Line (Hot) and Neutral wires are reversed.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Fault Description
).
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Page 104 of 148
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