Bryant 355MAV - Manual (Page 13)

Fig. 17—Service Label
A02279
COMPONENT TEST
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.
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.
- Water in vent piping, possible sagging pipe. - Disconnected or obstructed pressure tubing.
- Failed or "Out-of-Calibration" pressure switches.
33 LIMIT CIRCUIT FAULT - Indicates the limit, or flame rollout is open or the furnace is operating in
high-heat only mode due to 2 successive low heat limit trips. Blower will run for 4 minutes or
until open switch remakes whichever is longer. If open longer than 3 minutes, code changes
to lockout #13. If open less than 3 minutes status code #33 continues to flash until blower shuts
off. Flame rollout switch requires manual reset. Check for:
- Improper or misaligned limit and/or limit shield. - Defective switch or connections.
- Improper low-heat gas input adjustment.
- Loose blower wheel.
- Stuck high-heat solenoid in gas valve - Proper rear air baffle.
34 IGNITION PROVING FAULT - Control will try three more times before a lockout #14 occurs. If
flame signal is lost during blower on-delay period, blower will come on for the selected blower
off-delay. Check for:
- Gas valve defective or turned "OFF".
- Defective Hot Surface Igniter - Manual valve shut-off.
- Low inlet gas pressure - Flame sensor must not be grounded.
- Inadequate flame carryover or rough ignition. - Control ground continuity
- Green/Yellow wire
MUST be connected to furnace sheet metal.
- Proper flame sense micro amps (.5 micro amps DC min., 4.0 - 6.0 nominal).
- Oxide buildup on flame sensor (clean with fine steel wool.)
41 BLOWER MOTOR FAULT - Indicates the blower failed to reach 250 RPM or the blower failed to
communicate within the prescribed time limits. Thirty seconds after being turned ON or ten
seconds during steady-state operation.
42 INDUCER MOTOR FAULT - Indicates the inducer has not started within 20 seconds after a call for
heat, the inducer motor RPM is outside its valid range of operation, or the inducer RPM signal
was lost for 5 seconds during operation. Check for:
- Proper vent sizing.
- Restricted combustion air supply.
- Failed inducer motor. - Improper motor wiring.
43 LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS CLOSED- Check for:
- Plugged condensate drain. - Low inlet gas pressure (if LGPS used).
- Water in vent piping, possibly sagging pipe. - Improper pressure switch wiring.
- Stuck open low-heat pressure switch. - Disconnected or obstructed pressure tubing.
45 CONTROL CIRCUITRY LOCKOUT - Auto-reset after 1 hour lockout due to:
- Flame sense circuit falure. - Gas valve relay stuck open.
- Software check error.
Reset power to clear lockout. Replace control if status code repeats.
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.
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 is reversed.
STATUS LED CODE
SERVICE
To initiate the component test sequence, shut "OFF" the room thermostat or disconnect the "R" thermostat
lead. Reset power and then put setup switch "SW1-6" in the ON position to start the component test
sequence. Once initiated the furnace control will turn the inducer ON. The inducer motor will run for the entire
test. The hot surface igniter and blower motor will be turned ON for 15 seconds each. When the blower is
turned OFF the inducer will be turned OFF. When the component test is completed one or more of the
following codes will flash.
CODE DESCRIPTION
11 Indicates the inducer and blower motor tested OK. Visual check of hot surface igniter required.
25 SETUP ERROR - Same as code 25 above.
41 BLOWER MOTOR FAULT - Indicates blower motor failed test. Check blower, wiring, and furnace control.
42 INDUCER MOTOR FAULT - Indicates inducer motor failed test. Check inducer, wiring and furnace
control.
To repeat component test turn setup switch "SW1-6" OFF and then back ON. After component test is
completed put setup switch "SW1-6" in the OFF position and reconnect the "R" thermostat lead.
328072-101 REV. A
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.
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