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ERROR CODES LISTING FOR “WS” MODELS
E1 SHORT CYCLE SITUATION: Dened as a
compressor that starts and stops more frequently
than it should.
E2 KEYBOARD STUCK ERROR: If any key button
is stuck or pressed for 20 seconds or more, the
unit considers it stuck. If a key is stuck it will be
ignored until released. If the “Mode” key is stuck,
the unit’s function will default to Cool mode.
E3 FROST PROBE OPEN: Normal operation is
allowed. Ohm frost probe. Replace if Ohm value
not read. If Ohm value is present replace the
board.
E4 FROST PROBE SHORT: Normal operation is
allowed. Replace probe.
E5 INDOOR PROBE OPEN: Control assumes
indoor ambient temperature is 90 degrees F and
unit will operate. Ohm indoor probe. Replace
probe if Ohm value is not present.
E6 INDOOR PROBE SHORT: Control assumes
ambient temperature is 90 degrees F and unit
will operate. Replace probe.
(See note and other infomation below)
ERROR CODES LISTING FOR “WE/WY” MODELS
E1 SHORT CYCLE SITUATION: Dened as a
compressor that starts and stops more frequently
than it should.
E2 KEYBOARD STUCK ERROR: If any key button
is stuck or pressed for 20 seconds or more, the
unit considers it stuck. If a key is stuck it will be
ignored until released. If the “Mode” key is stuck,
the unit’s function will default to Cool mode.
E3 AMBIENT (INDOOR) AIR PROBE OPEN
OR SHORT: Control will assume ambient
temperature is 90 degrees F when in Cool mode
and 60 degrees F when in Heat mode. Unit will
operate (see note below).
E4 EVAPORATOR TEMPERATURE PROBE
OPEN OR SHORT: Normal operation is allowed.
Replace probe (see note below).
E5 CONDENSER TEMPERATURE PROBE
OPEN OR SHORT: Normal operation is allowed.
Replace probe.
E7 MOTOR OPERATION
E9 HEAT PUMP FAILURE
NOTE: All error codes display for probes open or shorted will
allow unit to operate. Unit may ice up if faulty components
are not replaced.
Indoor Coil Frost Probe Sensor (WS/WE/WY Models):
Disables compressor at 30 degrees F+/- 3 degrees
F. Compressor resumes operation when indoor coil
temperature reaches 55 degrees F.
Outdoor Coil Frost Probe Sensor (on WY models):
Disables the compressor at 30 degrees F. Compressor
resumes operation when temperature reaches 43 +/- 5
degrees F.
Indoor Air Probe Sensor (WS/WE/WY Models)”:
Control range is 60 degrees F to 90 degrees F +/- 3
degrees F.
REBOOT THE CONTROL PANEL
To reboot the control panel on a WallMaster unit: with the
unit on, simultaneously hold down the Mode button and
the Temperature Arrow button for approximately 10
seconds. If the panel will reboot, you will hear the fan come
on and the temperature window will read 60 degrees. If this
happens, all you need to do is turn the unit off for about 10
seconds and then turn it back on to nish the reboot cycle. If
the panel does not reboot, you will most likely need to have
the panel replaced.
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