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Fig. 13—Service Label
A93297
- Stuck gas valve relay on control or miswire to gas valve circuit.
- Stuck-open gas valve or leaky gas valve.
- Obstructed pressure tubing.- Defective pressure switch (stuck closed).
- Short circuit in secondary voltage (24V) wiring.
- Proper vent sizing and condensate pitch. - Inadequate combustion air supply.
- Vent restriction or high winds. - Low inducer voltage.
- Defective inducer motor or start capacitor.
- Defective pressure switch or connections. If it opens after trial for ignition
period, blower will come on for 90 second recycle delay.
- Disconnected or obstructed pressure tubing.
- Defective blower motor or start capacitor. - Dirty filter or restricted duct system.
- Loose blower wheel. - Defective switch or connections.
- Inadequate combustion air supply (flame rollout switch only).
- Open flame rollout switch, manual reset.
- Oxide buildup on flame sensor (clean with fine sandpaper).
- Proper flame sense microamps (.5 microamps D.C. minimum).
- Gas valve turned off. - Manual shut-off valve.
- Green wire MUST be connected to furnace sheet metal.
- Inadequate flame carryover or rough ignition.
- Low inlet gas pressure.
SERVICE
COMPONENT TEST
1
2
3
456
7
8
9
STATUS
TEST
HUM C W Y R G
320615-102 REV. A
To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R"
thermostat lead. Briefly short the TEST terminal to the "C" terminal. Status LED will flash code
and then turn on the inducer motor, hot surface igniter, blower motor-heat speed, and blower
motor-cool speed for 10-15 seconds each.
BLOWER OFF
DELAY SELECT
EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST
DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT
BY THE NUMBER OF LONG FLASHES.
LED CODE
CONTINUOUS OFF
CONTINUOUS ON
RAPID FLASHING
- Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and SEC-2.
- Control has 24V power.
- Line voltage (115V) polarity reversed. If twinned, 24V power to
one furnace may be out of phase with 24V power to other furnace.
STATUS
11
12
13
14
21
22
23
24
31
33
34
NO PREVIOUS CODE - Stored status codes are erased when power (115V or 24V) to
control is interrupted or 48 hours after each fault is cleared.
BLOWER ON AFTER POWER UP (115V OR 24V) - Blower runs for 90 seconds, if unit
is powered up during a call for heat (R-W closed).
LIMIT OR FLAME ROLLOUT SWITCH LOCKOUT - Auto reset after three hours. Flame
rollout switch requires manual reset. Refer to #33.
IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to #34.
GAS HEATING LOCKOUT - Control will NOT auto reset.
Check for:
ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is
de-energized. Inducer will run until fault is cleared.
Check for:
PRESSURE SWITCH DID NOT OPEN Check for:
SECONDARY VOLTAGE FUSE IS OPEN
Check for:
PRESSURE, DRAFT SAFEGUARD, OR AUXILIARY LIMIT (when used) SWITCH DID
NOT CLOSE OR REOPENED - If open longer than five minutes, inducer shuts off for
15 minutes before retry. Check for:
LIMIT OR FLAME ROLLOUT SWITCH IS OPEN - If open longer than three minutes, code
changes to #13. Check for:
IGNITION PROVING FAILURE - Control will try three more times before a lockout #14
occurs. If flame signal lost after trial for ignition period, blower will come on for 90 second
recycle delay.
Check for:
SERVICE LABEL
9