Friedrich Twintemp, Service Manual

Page: 20 / 68

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 flash 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.
Activate Error Code Mode by pressing at the same time
the “A/C START” button and the “ON/OFF” button on
QME models. LED for the “TIMER ON/OFF” will flash
1 bps while Error Code Mode is active. Pressing the
“TEMP ” button will display 00. Consecutive presses
will scroll through all error codes logged. Press the
“TEMP ” 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.
IMPORTANT: Error Codes are cleared from the log by
exiting from Error Code Mode. To exit on XQ models,
press Timer On/Off button. To exit QME models,
press A/C Start and On/Off buttons. Or unplug unit to
exit Error Code Mode. Plug unit in after 5 seconds to
resume normal operation of unit.
TESTING THE ELECTRONIC CONTROL
ERROR CODE LISTINGS
E1 SHORT CYCLE SITUATION: Defined 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:
(QME units) The Fan Speed button and the
Temperature button.
(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.
Check Filter: The Check Filter indicator turns on after
the fan motor has been operating for 250 hours. The
Check Filter indicator is reset by pressing the Check
Filter button one time only. Power failures will not reset
the 250 hour timer. All time elapsed is stored in memory
and resumes counting after power is restored.
Keep Alive: The electronic control has a memory to
retain all functions and status as set up by the user in
the event of a power failure. Once power is restored
to the unit there is a two second delay before the fan
comes on and approximately three minutes delay
before the compressor is activated, providing that the
mode was set for cooling and the set point temperature
has not been met in the room.
18