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SERVICE/STATUS CODE INSTRUCTIONS
If status code recall is needed disconnect the “R” thermostat lead, reset power, and put setup switch “SW1--1” in the ON position. To clear the
status code history put setup switch “SW1--1” in the ON position and jumper thermostat terminals “R”, “W/W1”, and “Y/Y2” simultaneously
until status code #11 is flashed.
LED CODE
STATUS
CONTINUOUS OFF --
Check for 115 VAC at L1 and L2, and 24 VAC at SEC--1 and SEC--2.
CONTINUOUS ON --
Control has 24 VAC power.
RAPID FLASHING --
Line voltage (115 VAC) polarity
reversed.
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.
11 NO PREVIOUS CODE
– Stored status codes are erased automatically after 72 hours or as specified above.
12 BLOWER ON AFTER POWER UP
– (115 VAC or 24 VAC) – Blower runs for 90 seconds, if unit is powered up during a call for heat
(R--W/W1 closed) or (R--W/W1 opens) during the blower on--delay period.
13 LIMIT CIRCUIT LOCKOUT
– Lockout occurs if the limit, or flame rollout switch is open longer than 3 minutes or 10 successive limit trips
occurred during high--heat. Control will auto reset after 3 hours. Refer to status code #33.
14 IGNITION LOCKOUT
– Control will auto reset after 3 hours. Refer to status code #34.
15 BLOWER MOTOR LOCKOUT
– Indicates the blower failed to reach 250 RPM or the blower failed to communicate within 30 seconds
after being turned ON in two successive heating cycles. Control will auto reset after 3 hours. Refer to status code #41.
21 GAS HEATING LOCKOUT
– Control will NOT auto reset. Check for:
Mis--wired gas valve.
Defective control (valve relay).
22 ABNORMAL FLAME--PROVING SIGNAL
– Flame is proved while gas valve is de--energized. Inducer will run until fault is cleared.
Check for:
Leaky gas valve.
Stuck--open gas valve.
23 PRESSURE SWITCH DID NOT OPEN
– Check for:
Obstructed pressure tubing.
Pressure switch stuck closed.
24 SECONDARY VOLTAGE FUSE IS OPEN
– Check for :
Short circuit in secondary voltage (24 VAC) wiring.
25 MODEL SELECTION OR SETUP ERROR
– Either Indicates the model plug (PL4) is missing or incorrect or setup switch “SW1--1” or
“SW1--6” is positioned improperly. If code flashes only 4 times on power--up control is defaulting to model selection stored in memory.
Check the following:
Thermostat call with “SW1--1” ON.
Thermostat call with “SW1--6” ON.
“SW1--1” and “SW1--6” both ON together.
Two different furnace models twinned.
Wiring diagram for model plug number and resistance values if code flashes continuously.
Board does not recognize model plug. Verify model plug part number to model plug table shown on furnace wiring label.
31 HIGH--HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR REOPENED
– Indicates the high--heat pressure switch input
failed to close on a call for high--heat, or opened during high--heat. Control relay may be defective or gas valve is mis--wired. Refer to status
code #32.
32 LOW--HEAT PRESSURE SWITCH DID NOT CLOSE OR REOPENED
– Indicates the low--heat pressure switch input failed to close
on a call for low--heat, or opened during low--heat. If opens during blower on--delay period , blower will come on for the selected blower
off--delay. If opens within 5 minutes after ignition the next heating cycle will be restricted to high--heat. Check for:
Proper vent sizing.
Plugged condensate drain.
Low inlet gas pressure (if LGPS used).
Excessive wind.
Restricted combustion air supply.
Improper pressure switch wiring.
Failed or “Out--of--Calibration” pressure switches.
Water in vent piping, possible sagging pipe.
Disconnected or obstructed pressure tubing.
