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13
TESTING THE ELECTRONIC CONTROL
BOARDS FOR XQ MODELS
Activating Test Mode:
Activate test mode by pressing at the same time the
“MODE” button and the “TEMP ” button on XQ
models. LEDs for Hour, Start, and Stop will blink 1 bps
while Test Mode is active.
Test Mode has duration of 90 minutes. Test Mode can
be activated under any conditions, including Off. Test
Mode is cancelled by pressing the On/Off button,
unplugging the unit, or when the 90 minutes is timed
out. All settings revert to the factory default settings of
Cool, 75 degrees F, Timer and Set Hour features are
nonfunctional.
Test Mode overrides the three-minute lockout, all
delays for compressor and fan motor start / speed
change, and no delay when switching modes.
Test Mode default settings are ON, Money Saver, 60
degrees F, and High fan speed.
IMPORTANT: Error Codes are cleared from the
log by exiting from Error Code Mode. To exit on XQ
models, press Timer On/Off button. Or unplug unit to
exit Error Code Mode. Plug unit in after 5 seconds to
resume normal operation of unit.
Activating Error Code Mode: (Submode of Test Mode)
Unit must be in Test Mode to enter Error Code Mode
1. Activate Error Code Mode by pressing the “TIMER ON/
OFF” button on XQ models. LED for the “TIMER ON/OFF”
will ash 1 bps while Error Code Mode is active. Pressing
the “TEMP/HR ” button will display 00. Consecutive
presses will scroll through all error codes logged. Press
the “TEMP/HR ” button to see the reverse order of all
error codes logged. When the end of logged error codes is
reached the temperature set point will appear.
COMPONENTS TESTING
ERROR CODE LISTINGS
E1 SHORT CYCLE SITUATION: Dened as (compressor
powered on before the three minute time delay ten times in
one hour. Investigate and correct short cycling problem.
E2 KEYBOARD STUCK ERROR: If key button(s) are
pressed continuously for twenty seconds or more. If MODE
key is stuck, unit will default to cool. Exit Error Code
Mode to see if error “E2” is no longer displayed and unit is
functioning. Replace board if “E2” still displays after exiting
Error Code Mode.
E3 FROST PROBE OPEN: Normal operation is allowed.
Ohm frost probe. Replace probe if ohm value not read. If
ohm value is present replace board.
E4 FROST PROBE SHORT: Normal operation allowed.
Replace probe.
E5 INDOOR PROBE OPEN: Control assumes indoor
ambient temperature is 90 degree F and unit will operate.
Ohm indoor probe. Replace probe if ohm value not read.
E6 INDOOR PROBE SHORT: Control assumes ambient
temperature is 90 degree F and unit will operate. Replace
probe.
NOTE: All Error Code displays for Frost & Indoor Probe
will allow unit to operate. Unit may or will ice up if faulty
components not replaced.
FROST PROBE SENSOR: disables compressor at 35
degrees F.
INDOOR PROBE SENSOR: Control range is 60 degrees F
to 90 degrees F +/- 2 degrees F.
Indoor temperature will be displayed by pressing:
(XQ units) The Fan Speed button and the “TEMP ”
button.
The indoor temperature will be displayed for 10 seconds.
The display will change back to the Set Point temperature
by pressing any key button except for the On/Off button.
The indoor temperature can be viewed in all modes,
including test mode.
PM
X Star
Temp/Hour
Cool
Money Saver
®
Fan Only
Clock
Start Time
Stop Time
Power
Fan
Speed
Mode
Timer
On/Off
Set
Hour