Carrier 40MKCB**C/124ANS, Installation Instructions Manual

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24
Table 22 – Troubleshooting
PROBLEM POSSIBLE CAUSE SOLUTION
Compressor and Fan of
the Outdoor Unit Will Not
Start
Unit not energized Check the main power connection.
Main switch is set to OFF Check and put it to ON position.
Main switch fuses are blown Replace fuses.
Compressor cycling protection is on Wait for 3 minutes.
Main power voltage is too low Check and set to the correct voltage.
Electrical connections are too loose or are wrong Check and tighten or correct connections.
Compressor Will Not Start,
But Outdoor Fan is
Operating
Electrical connections of compressor are loose or wrong Check and tighten or repair compressor.
Compressor Stops Due to
Over---temperature
Compressor burnt out; seized or protection device on
Check for the cause and replace compressor if
necessary.
Wrong refrigerant charge in unit (excessive or low) or air or other
non---condensable gasses in the circuit
Drain refrigerant, evacuate and recharge.
CAUTION : Do not vent refrigerant to the atmosphere;
use refrigerant recovery equipment.
Main voltage is too high or too low Check voltage setting and adjust if necessary.
Condenser coil obstructed Remove obstruction.
Outdoor fan off Check cause and resume operation or repair.
Wrong indoor unit thermistors Replace thermistors.
Refrigerant circuit clogged Check and remove obstructions.
Reversing valve faulty on heat pump models Replace reversing valve.
Expansion device clogged or covered with ice
Drain refrigerant, evacuate and recharge.
CAUTION : Do not vent refrigerant to the atmosphere;
use refrigerant recovery equipment.
Compressor Runs
Continuously
Unit selected is too small for application requirements
Contact a qualified service technician for a system
evaluation.
Indoor temperature setting too low or too high Check temperature setting.
Outdoor unit fan faulty Replace outdoor fan.
Air or other non---condensable gasses in the circuit
Drain refrigerant, evacuate and recharge.
CAUTION
: Do not vent refrigerant to the atmosphere;
use refrigerant recovery equipment.
Obstructions at air intake or dirty indoor unit filters Remove obstruction and/or clean filter.
Frequent Ice---Build---Up
on Outdoor Coil
Outdoor fan is stopped Check cause and repair.
Discharge Pressure Too
High
Outdoor coil dirty or obstructed Clean or remove obstructions.
Condenser fan faulty Replace condenser fan.
Indoor temperature setting too low or too high Check temperature setting.
Air or other non---condensable gasses in the circuit
Drain refrigerant, evacuate and recharge.
CAUTION : Do not vent refrigerant to the atmosphere;
use refrigerant recovery equipment.
Discharge Pressure Too
Low
Indoor temperature setting too high or too low Check temperature setting.
Outdoor coil dirty or obstructed Clean or remove obstructions.
Indoor unit air filter dirty Clean filter.
Suction Pressure Too High
Indoor temperature setting too high or too low Check temperature setting.
Reversing valve faulty or internal leak Replace reversing valve.
Suction Pressure Too Low
Indoor temperature setting too high or too low Check temperature setting.
Evaporator coil covered with ice
Air circulation on the evaporator not sufficient; check
and repair.
Expansion device or suction line clogged Check and repair.
Outdoor fan does not stop during defrost periods Check electrical parts.
Outdoor Fan Cycling Due
to Over---Temperature
Protection
Electrical connection loose Check connections.
Fan motor burn out Replace.
Fan bearing seized Check and repair.
Expansion device clogged or covered with ice
Drain refrigerant, evacuate and replace.
CAUTION: Do not vent refrigerant to the atmosphere;
use refrigerant recovery equipment.
NOTE : For additional diagnostic information, refer to the “Service Manual”.
Copyright 2015 CAC / BDP
D
7310 W. Morris St.
D
Indianapolis, IN 46231 Edition Date:07/15
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:40MKC(Q)B---C---01SI
Replaces: NEW