Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 5
– TROUBLESHOOTING GUIDE
OMM-0118_B
•
GF-203
•
5/9/2019
Technical Support
•
(800) 526-0288
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Mon-Fri, 8 am - 5 pm EST Page 73 of 148
TABLE 5-1: Boiler Troubleshooting Procedures
FAULT
INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
REMOTE
SETPT
SIGNAL FAULT
1.
Remote setpoint signal not present:
Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.
2.
Signal is not isolated (floating) if 4 to 20 mA.
3.
C-More Controller signal type selection switches
not set for correct signal type (voltage or
current).
1.
Check I/O Box to ensure signal is hooked up.
Hook up if not installed.
If installed, check polarity.
Measure signal level.
Check continuity of wiring between source and unit.
2.
Check signal at source to ensure it is isolated.
3.
Check DIP switch on PMC board to ensure it is set correctly for the
type of signal being sent. Check control signal type set in
Configuration
menu.
RESIDUAL
FLAME
1.
Defective Flame Detector.
2.
SSOV not fully closed.
1.
Replace Flame Detector.
2.
Check open/close indicator window of Safety Shut-Off Valve (SSOV)
and ensure that the SSOV is fully closed. If not fully closed, replace
the valve and or actuator.
Close the 2” Gas Shut-Off Valve downstream of SSOV (Figure 5-1).
Install a manometer or gauge at the leak detection port between the
SSOV and Gas Shut Off Valve. If a gas pressure reading is observed
replace the SSOV Valve and/or Actuator.
SSOV FAULT
DURING
PURGE
See SSOV SWITCH OPEN
SSOV FAULT
DURING RUN
1.
SSOV switch closed for 15 seconds during run.
1.
Replace actuator.
SSOV RELAY
FAILURE
1.
SSOV relay failed on IGST board.
2.
Floating Neutral.
3.
Hot and Neutral reversed at SSOV.
1.
Press
CLEAR
button and restart unit. If fault persists, replace
Ignition/Stepper (IGST) Board.
2.
The Neutral and Earth Ground are not connected at the source and
therefore there is a voltage measured between the two. Normally this
measurement should be near zero or no more than a few millivolts.
3.
Check SSOV power wiring.
