BMK 5000-6000 Boiler OPERATION-SERVICE-MAINTENANCE GUIDE
SECTION 5 – TROUBLESHOOTING GUIDE
OMM-0124_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
71
of
136
GF-208
Ph.: 800-526-0288
05/02/2017
TABLE 5-1: BOILER TROUBLESHOOTING PROCEDURES
FAULT
INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
PRG SWTCH
CLOSED
DURING
IGNITION
(continued)
3.
4.
Switch wired incorrectly.
5.
Defective Power Supply Board or fuse.
6.
Defective IGST Board.
3.
If the Air/Fuel Valve does rotate to the ignition position, check the
purge switch for continuity between the N.O. and COM terminals. If
the switch shows continuity when not in contact with the cam, check
to ensure that the switch is wired correctly (correct wire numbers on
the normally open terminals).
4.
If the switch is wired correctly, replace the switch.
5.
Check DS1 & DS2 LEDs on Power Supply Board. If they are not
steady ON, replace Power Supply Board.
6.
Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every
second. If not, replace IGST Board.
PRG SWTCH
OPEN
DURING PURGE
1.
Defective Purge
switch.
2.
No voltage present at switch.
3.
Switch wired incorrectly.
4.
Defective Power Supply Board or fuse
5.
Defective IGST Board.
1.
If the air-fuel valve does rotate, check Purge
switch for continuity
when closing. Replace switch if continuity does not exist.
2.
Measure for 24 VAC from each side of the switch to ground. If
24VAC is not present, refer fault to qualified service personnel.
3.
Check to ensure that the switch is wired correctly (correct wire
numbers on the normally open terminals).
4.
Check DS1 & DS2 LEDs on Power Supply Board. If they are not
steady ON, replace Power Supply Board.
5.
Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every
second. If not, replace IGST Board.
RECIRC PUMP
FAILURE
1.
Internal recirculation pump failed.
1. Replace recirculation pump.
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.
