Aerco Benchmark BMK 750 User Manual page 85

Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
APPENDIX B – STARTUP, STATUS, AND FAULT MESSAGES
TABLE B-2: Fault Messages
FAULT MESSAGE
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-0128_0C
GF-206-K
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 Indicates 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.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
FAULT DESCRIPTION
Page 85 of 146
11/29/2017