Heat Pump Unit - McQuay M5WM Series Installation And Maintenance Manual

Heat Pump Unit

Table 7 shows the LED indicator lights for the heat pump unit under normal operation and fault conditions. The LED
indicator lights are located at the bottom right side of
the indoor unit.
The heat pump units are equipped to maintain selected room temperature by switching automatically to either "cool" or
"heat" mode.
Figure 23. LED Indicator Lights: Normal Operation and
Fault Conditions for Heat Pump Unit
Table 7. LED Indicator Lights: Normal Operation and Fault Conditions for Heat Pump Unit
Cool
Dry Fan
ON
* Unit has 10 minutes delay before it will switch between modes.
IM-5WMF(SEER13)-0706
Heat
Sleep
Cooling
/
Dry
Fan
Heat
/
/ Auto mode in heating
operation. *
/ Auto mode in cooling
operation. *
Compressor cycling on
overload
Indoor coil sensor loose
or defective
Outdoor coil sensor
loose or defective
Room air sensor loose
or defective
Unit Malfunctions
/ ON or OFF
Mode or Fault
-
-
-
-
-
-
Low outdoor air flow, defective
compressor or overload.
Attach or replace.
Attach or replace.
Attach or replace.
If in AUTO or SLEEP mode, switch to
Heat, turn SLEEP off, unplug power
cord and plug back in.
If both lights blink with unit in Heat or
Cool and SLEEP off, the problem may
be coil sensor, compressor has tripped
or low refrigerant.
Action
Blinking
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