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SECTION 15: TROUBLESHOOTING
55
SECTION 15: TROUBLESHOOTING
15.1 Troubleshooting Flow Chart
Wrong end vent plate may
be installed. Make sure plate
and burner match.
Is the vacuum setting
too high?
Ye s
Adjust system for proper
vacuum at the end vent.
Is the pump impeller
obstructed?
No
Motor bearings may have
failed. Replace motor.
Is the motor connected properly?
Refer to the wiring diagrams on the
motor and in the installation manual.
Motor may have tripped
overload switch. Wait 10-15
minutes for automatic reset.
No
Disconnect power to the
motor. Does the motor
turn freely?
No
Is the motor hot?
No
Ye s
Replace burner transformer.
Replace ignition module.
Is there 24V at the burner
transformer secondary (blue
and yellow wires)?
Ye s
No
Troubleshoot Ends
Pre-purge. Wait 45 seconds.
Do the burners light?
Check LED on module and
refer to LED codes below.
Ye s
No
Correct gas problem.
Check wiring to the burner.
Make sure the burner is
plugged in.
Check thermostat wiring and
replace thermostat if
necessary.
No
Do all the burners ignite
smoothly?
No
Ye s
Check circuit breaker and/or
fuse on panel supply circuit.
Refer to control
panels listed below.
Does pump turn on?
Ye s
Is there power (120V) to
the control?
(panel or relay)
Ye s
No
START
No
Check for proper vacuum
at end vent.
Unplug the burner, wait 10
seconds, then plug it in
again. Does the ignition
module begin ignition
sequence by sparking?
Is there proper gas pressure
and flow to the burners?
Ye s
No
No
Ye s
Is there power (120V) at the
burner receptacle?
No
Ye s
Refer to control
panel list.
No
Ye s
Refer to control panel
manuals list.
Is there power to the zone?
After 45 seconds pre-purge
period, do the burners light?
No
Turn up thermostat.
Does the pump turn on?
No
Ye s
Ye s
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