Friedrich VRP12K, Руководство по обслуживанию и запасным частям

Страница: 175 / 221

175 PB
TROUBLESHOOTING
Diagnostic Codes
Diag
#
Description Diagnostic Check point Solution
47 MCS Compressor I2T Fault
“The MCS board has flagged an Compressor
I2T fault and has notified the FMC.”
The Compressor is operating at max
allowable amperage for an extended period )
The problem occurred more than 5 times
within an hour
1. Dangerously low charge.
2. Abnormally high outdoor temperatures
3. Restriction in the sealed system.
4. A damaged compressor.
Power cycle the unit and see if the problem
persists, if so:
1. Ensure the EEV is operational.
2. Infer the presence of a sealed system
obstruction and reprocess/repair if
necessary.
3. Replace the compressor.
4. Replace MCS
48 MCS Indoor Fan I2T Fault
The MCS board has flagged an IDF I2T fault
and has notified the FMC.
(The indoor fan is operating at max allowable
amperage for an extended period of time)
The problem occurred more than 5 times
within an hour
1. Restricted Airflow
2. Abnormally high outdoor temperatures
3. Damaged Indoor Fan
Power cycle the unit and see if the problem
persists, if so:
1. Check that the indoor fan blade is moving
(i.e. locked rotor).
2. Check that the indoor air supply is not
impeded
3. Replace the indoor fan.
49 MCS Outdoor Fan I2T Fault.
The MCS board has flagged an ODF I2T fault
and has notified the FMC.
(The outdoor fan is operating at max
allowable amperage for an extended period
of time)
The problem occurred 5 or more times within
an hour
1. Restricted Airflow
2. Abnormally high outdoor temperatures
3. Damaged Outdoor Fan
This condition requires a system reset.
1. Check that the outdoor fan blade is moving
(i.e. locked rotor/frozen drain pan).
2. Check that the outdoor air supply is not
impeded
3. If the problem continues, replace the
outdoor fan.
50 MCS 15V Rail Fault.
The MCS board has flagged a 15V rail fault
and has notified the FMC.
There is an issue with the 15 V rail on the
MCS
This condition requires a system reset.
1. Restart the system with the FMC
disconnected from the MCS.
A. If the processor has a red light when
rebooted, replace the MCS.
52 MCS PFC Over Voltage
The MCS board has flagged a PFC over
voltage and has notified the FMC.
The MCS board has flagged a PFC over
voltage and has notified the FMC.
The MCS board has flagged a PFC over
voltage and has notified the FMC.
53 MCS AC Line Under Voltage.
The MCS board has flagged an AC line under
voltage and has notified the
FMC.”
The input AC line voltage is less than 187V
rms
The system will require a reset.
1. If the system does not power up, replace
the MCS board.
2. Ensure that there were no brownouts in
the area recently.
3. Ensure that the input voltage is greater
than 187V. If it is less than 187V this error
may occur
often due to voltage sag.
54 MCS AC Line Over Voltage.
“The MCS board has flagged an AC line over
voltage and has notified the
FMC.”
The input AC line voltage exceeds 293V rms. The system will require a reset.
1. If the system does not power up, replace
the MCS board.
2. Ensure that the input voltage is less than
293V. If it is greater than 293V this error may
occur
often due to voltage spikes.