Friedrich WallMaster WCT16 - Diagnostic Codes

29
M. TROUBLESHOOTING
COMPLAINT CAUSE SOLUTION
Unit Does Not Cool/ Heat Room
Sufciently, or Cycles On And Off
Too Frequently (continued).
• The outside temperature is below 60 °F
(16 °C).
• Do not try to operate your air conditioner in the cooling mode
when the outside temperature is below 60 °F (16 °C). The unit will
not cool properly, and the unit may be damaged.
• The digital control is set to fan cycling mode.
• Since the fan does not circulate the room air continuously at this
setting, the room air does not mix as well and hot (or cold) spots
may result. Using the continuous fan setting is recommended to
obtain optimum comfort levels.
• The air conditioner has insufcient cooling
capacity to match the heat gain of the room.
• Check the cooling capacity of your unit to ensure it is properly
sized for the room in which it is installed. Room air conditioners are
not designed to cool multiple rooms.
• The air conditioner has insufcient heating
capacity to match the heat loss of the room.
• Check the heating capacity of your unit. Air conditioners are sized to
meet the cooling load, and heater size is then selected to meet the
heating load. In extreme northern climates, room air conditioners may
not be able to be used as a primary source of heat.
Unit Runs Too Much.
• This may be due to an excessive heat load
in the room.
• If there are heat producing appliances in use in the room, or if the
room is heavily occupied, the unit will need to run longer to remove
the additional heat.
• It may also be due to an improperly sized unit.
• Be sure to use exhaust vent fans while cooking or bathing and,
if possible, try not to use heat producing appliances during the
hottest part of the day.
• This may be normal for higher efciency
(EER) air conditioners.
• The use of higher efciency components in your new air
conditioner may result in the unit running longer than you feel
it should. This may be more apparent, if it replaced an older,
less efcient, model. The actual energy usage, however, will be
signicantly less when compared to older models.
• You may notice that the discharge air
temperature of your new air conditioner
may not seem as cold as you may be
accustomed to from older units. This
does not; however, indicate a reduction
in the cooling capacity of the unit.
• The energy efciency ratio (EER) and cooling capacity rating
(Btu/ h) listed on the unit’s rating plate are both agency certied.
M.2 Diagnostic Codes
M.1. Troubleshooting Tips (Cont)
DIAG
CODE
PROBLEM CONTROL BOARD'S ACTION
1 Front Panel Button Stuck For More Than 20
Seconds
Continue to monitor for "OPEN" (Unstuck) switch. Do not process switch input. ENSURE
FRONT COVER DOES NOT DEPRESS BUTTONS
3 Indoor Temperature Sensor is Open or
Shorted
Set temp to 75°F in COOLING or 68°F in HEATING. Unit continues to operate
4 Indoor Coil Temperature Sensor is Open or
Shorted
Control Board sets temp to a default of 40°F. Override sensor. Unit continues to operate.
5 Outdoor Coil Temperature Sensor is Open or
Shorted
Sets temp to 20°F. Override sensor. Continue operation. Use Electric Heat if available
for HEATING. If not available use HEAT PUMP if outdoor temp allows.
6 Outdoor Coil greater than 175° F Turn Compressor off. Wait for the outdoor coil to be less than 150°F for more than 2
consecutive minutes.
7 Indoor Coil less than 30° F for 2 consecutive
minutes
Turn compressor and electric heat off. When coil temp reaches 45°F resume operation
after lockout time.
8 Unit Cycles greater than 9 Times per hour Continue operation. Continue to monitor. Take no action. Log Only.
9 Unit Cycles less than 3 Times per Hour Continue operation. Continue to monitor. Take no action. Log Only.