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SECTION 9: TROUBLESHOOTING
39
Troubleshooting Flow Chart (continued)
Adjust system for proper
vacuum at the end vent.
See Commissioning of the
CRV System for details.
Wrong end vent plate may
be installed. Make sure
plate and burner match.
Is the end vent vacuum
setting too high?
Yes
No
Replace burner transformer.
Replace ignition module.
Is there 24 V at the burner
transformer secondary
(blue and yellow wires)?
Yes
No
Troubleshoot Ends
Pre-purge. Wait 45 seconds.
Do the burners light?
Check LED on module and
refer to LED codes below.
Yes
No
Check for proper vacuum
at end vent. See
Commissioning of the
CRV System for details.
Unplug burner, wait 10
seconds, then plug it in again.
Does the ignition module
begin ignition
sequence by sparking?
No
Yes
Replace plug-in relay. See
Replacement Parts section.
Correct gas problem. See
gas piping section of
CORAYVAC
®
IOS manual
(P/N 127102NA)
Is there proper gas pressure
and flow to the burners?
Yes
No
Verify wiring between
controller and burner.
Contact your
ROBERTS GORDON
®
Independent Distributor.
No
Is there 24 Vac across the
control board 24 V output
(#1-3) for that zone?
No
Ye s
Is there continuity across
meter input #4 (pressure
switch input) on the control
board?
Do all the burners
ignite smoothly?
No
No
On the relay board, is the
appropriate zone relay
(#1-3) LED lit?
After 45 seconds pre-purge
period, do the burners light?
No
Verify pressure switch wiring
and operation. Replace
pressure switch if necessary.
No
Is there power at the
burner recepticle?
No
Yes
Is there 24 Vac across the
relay board's appropriate 24
V output connection (#1-3)?
Secure wiring between 24 V
output on the control board
and output connection on
the relay board.
Yes
Contact your
ROBERTS GORDON
®
Independent Distributor.
Are shield wires from RS-485
communication wiring and
VFD 0-10 V signal wiring
correctly twisted and/or
grounded?
No
Yes
Are pump and/or burners
turning on and off erratically?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ignition Module Diagnostic Codes:
LED Problem Solution
4 second steady
flash at start of cycle Normal Wait for valve to open
Steady on Microprocessor failure Replace module
within module
Three flashes Ignition lockout Recycle unit: check for
Lockout of module spark and valve opening and
after 3 tries replace:if none, replace module
Yes