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53
12.1 Troubleshooting Flow Chart
Remove obstruction.
Turn up thermostat.
Does the blower turn on
?
Place a jumper across the
thermostat terminals.
Does the blower turn on
?
Is there power 120 V at the
burner?
Disconnect power to burner
.
Does the blower turn freely
?
Is the blower obstructed?
Blower bearings may have
failed. R
eplace blower
.
Check thermostat wiring
and replace thermostat if
necessary
.
Check relay wiring
(if applicable) and wiring
to the burner
.
Replace blower
.
Is there spark at the igniter?
Disconnect power from burner and check igniter and ignition
wire
. Are they damaged?
Is the igniter gap
set at 1/8"?
Is the vent pipe or the inlet of
the burner obstructed?
Remove obstruction.
Replace igniter and
ignition wire as needed.
Carefully reset spark gap
to 1/8"
.
Are the air hoses to the
pressure switch secure and
leak free
?
Repair
, replace
, or tighten
hoses as necessary
.
Check wiring between the
blower motor and
transformer
.
With the blue and yellow wires still removed, is the voltage at the transformer
black and white leads 120 V?
Remove the blue and yellow wires from the transformer
.
Is there 24 V at the
transformer secondary
?
Replace transformer
.
Reconnect transformer
wires. Place a jumper wire across the pressure switch.
Is there a spark?
Replace pressure switch.
Replace ignition module
.
LED
Problem
Solution
4 second steady
flash at start of cycle
Normal
W
ait for valve to open
Steady on
Microprocessor failure within
module
Replace module
Three flashes
Ignition lock
out
Lock
out of module after 3 tries
Recycle unit: Check for spark and valve opening
and replace
. If none
, replace module
.
Module Diagnostic Codes:
YES
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
YES
YES
NO
YES
NO
NO
NO
YES
YES
NO
NO
NO
NO
Summary of Contents for IRH
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