Benchmark 1500 - 2000 Boilers
APPENDIX B – STARTUP, STATUS & DISPLAY MESSAGES
OMM-0097_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 141 of 182
GF-142 Ph.: 800-526-0288 10/01/2015
Table B-2: Fault Messages – Continued
FAULT MESSAGE FAULT DESCRIPTION
LOW WATER
LEVEL
The Low Water Cutoff board is indicating low water level.
NETWORK COMM
FAULT
The RS-485 network information is not present or is
corrupted.
O
2
% OUT OF RANGE The O
2
% has gone below 3% or above 8%.
OUTDOOR TEMP
SENSOR FAULT
The temperature measured by the Outdoor Air Sensor is out
of range.
OUTLET TEMP
SENSOR FAULT
The temperature measured by the Outlet Sensor is out of
range:
• OUTLET TEMPERATURE display = SHt Indicates
sensor is shorted
•
OUTLET TEMPERATURE display = Opn indicates
sensor is open-circuited
PRG SWTCH CLOSED
DURING IGNITION
The Purge Position Limit switch on the Air/Fuel Valve closed
during ignition.
PRG SWTCH OPEN
DURING PURGE
The Purge Position Limit switch on the Air/Fuel Valve opened
during purge.
REMOTE SETPT
SIGNAL FAULT
The Remote Setpoint signal is not present or is out of range.
RESIDUAL
The Flame signal was seen for more than 60 seconds during
standby.
SSOV
SWITCH OPEN
The SSOV switch opened during standby.
SSOV FAULT
DURING PURGE
The SSOV switch opened dug 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.
STEPPER MOTOR
FAILURE
The Stepper Motor failed to move the Air/Fuel Valve to the
desired position.
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