Carrier 48XL User Manual download pdf (Page 19)

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Liquid Line Solenoid

* SUPPLIED BY UTILITY PROVIDER

Fig. 18 - 2-Stage HP/AC Control Board

STATUS CODE 21 - GAS HEATING LOCKOUT

Control will NOT auto reset. Check for mis-wired gas valve or

defective control (valve relay).

STATUS CODE 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 or stuck-open gas

valve,

STATUS CODE 23 - PRESSURE SWITCH DID NOT OPEN

Check for obstructed pressure tubing or pressure switch stuck

closed,

STATUS CODE 24 - SECONDARY VOLTAGE FUSE IS OPEN

Check for short circuit in secondary voltage (24VAC) wiring.

STATUS CODE 23 - INVALID MODEL SELECTION OR

SETUP ERROR

Indicates either the model plug is missing or incorrect. If code

flashes 4 times on power-up, control is defaulting to model

selection stored in memory. Check for proper model plug number

and resistance values per wiring diagram,

STATUS CODE 3f, 32 - PRESSURE SWITCH OR RELAY DID

NOT CLOSE OR REOPENED

Control relay may be defective. If open longer than five minutes,

inducer shuts off for 13 minutes before retry. If open during blower

on-delay period, blower will come on for the selected blower

off-delay. Check for excessive wind, restricted vent, defective

inducer motor, defective pressure switch, lower inducer voltage

(230VAC), inadequate combustion air supply, disconnected or

obstructed pressure tubing, or low inlet gas pressure (if LGPS

used).

STATUS CODE 33 - LIMIT CIRCUIT FAULT

Indicates a limit or flame rollout switch is open. 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. Check for loose blower wheel, restricted vent, excessive

wind, dirty filter or restricted duct system, defective switch or

connections, or inadequate combustion air supply (flame roll-out

switch open).

STATUS CODE 34 - IGNITION PROVING FAILURE

Control will try three more times before lockout 14 occurs. If flame

signal lost during blower on-delay period, blower will come on for

the selected blower off-delay. Check for oxide buildup on flame

sensor (clean with fine steel wool), proper flame sense microamps

(.3 microamps D.C, min,, 4,0-6,0 nominal), manual valve shutoff,

low inlet gas pressure, control ground continuity, gas valve

defective or turned off, flame sensor must not be grounded,

inadequate flame carryover or rough ignition, or green/yellow wire

must be connected to unit sheet metal.

STATUS CODE 4f - BLOWER MOTOR FAULT

Indicates the blower failed to reach 230 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,

STATUS CODE 43 - CONTROL CIRCUITRY LOCKOUT

Auto reset after one hour lockout due to gas valve relay stuck open,

flame sense circuit failure, or software check error. Reset power to

clear lockout. Replace control if status code repeats,

E. HP/AC Control Troubleshooting

See Table 4 for HP/AC control board status codes and

troubleshooting information,

STATUS CODE 33, OUTDOOR AIR TEMPERATURE

SENSOR FAULT - DETAILED DESCRIPTION

If an OAT sensor is found at power-up, input is constantly checked

to be within a valid temperature range. If sensor is found to be

open or shorted at any time after initial validation. Status Code 33

will be displayed at amber STATUS LED.

Check for faults in wiring connecting sensor to OAT terminals.

Using an Ohm meter, check resistance of thermistor for a short or

open condition.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 34 35

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Carrier 48XL User Manual Page 19

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