Watts AERCO Benchmark OMM-0121 Operation And Maintenance Manual page 87

Benchmark 750-3000 Boiler Operation & Maintenance Manual
APPENDIX B – STARTUP, STATUS, AND FAULT MESSAGES
TABLE B-2: Fault Messages
FAULT MESSAGE
NETWORK COMM
FAULT
O % OUT OF RANGE
2
OUTDOOR TEMP
SENSOR FAULT
OUTLET TEMP
SENSOR FAULT
PRG SWTCH CLOSED
DURING IGNITION
PRG SWTCH OPEN
DURING PURGE
REMOTE SETPT
SIGNAL FAULT
RESIDUAL
FLAME
SSOV
SWITCH OPEN
SSOV FAULT
DURING PURGE
SSOV FAULT
DURING IGN
SSOV FAULT
DURING RUN
SSOV RELAY
FAILURE
STEPPER MOTOR
FAILURE
OMM-0122_D • GF-206 • 5/9/2019
FAULT DESCRIPTION
The RS-485 network information is not present or is corrupted.
The
O % has gone below 3% or above 8%.
2
The temperature measured by the Outdoor Air Sensor is out of
range.
The temperature measured by the Outlet Sensor is out of range:
•
OUTLET TEMPERATURE display = SHt
sensor is shorted
•
OUTLET TEMPERATURE display = Opn indicates
sensor is open-circuited
The Purge Position Limit switch on the Air/Fuel Valve closed
during ignition.
The Purge Position Limit switch on the Air/Fuel Valve opened
during purge.
The Remote Setpoint signal is not present or is out of range.
The Flame signal was seen for more than 60 seconds during
standby.
The SSOV switch opened during standby.
The SSOV switch opened dug 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 Stepper Motor failed to move the Air/Fuel Valve to the desired
position.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Indicates
Page 87 of 164