Friedrich Floating Air Pro Multi-Zone FPHMR42A3A Service Manual page 266

Outdoor Fault Codes
Fault code
27
28
29
30
45
266
TROUBLESHOOTING
Fault description
Expansion valve A (gas
pipe) sensor fault
Expansion valve B (gas
pipe) sensor fault
Expansion valve C (gas
pipe) sensor fault
Expansion valve D (gas
pipe) sensor fault
PM fault
Possible reasons for
abnormality
"1. The wiring of
the sensor for the
expansion valve A
(gas pipe) is connected
loosely;
2. The sensor of the
expansion valve A (gas
pipe) fails;
3. The sampling circuit
fails."
"1. The wiring of
the sensor for the
expansion valve B
(gas pipe) connect is
connected loosely;
2. The sensor of the
expansion valve B (gas
pipe) fails;
3. The sampling circuit
fails."
"1. The wiring of
the sensor for the
expansion valve B
(gas pipe) connect is
connected loosely;
2. The sensor of the
expansion valve C (gas
pipe) is fails;
3. The sampling circuit
fails."
"1. The wiring of
the sensor for the
expansion valve B
(gas pipe) is connected
loosely;
2. The sensor of the
expansion valve D (gas
pipe) fails;
3. The sampling circuit
fails."
There are many reasons
for this failure. You can
check the driver board
fault LED to further
analyze the fault code of
the drive board and to
learn about what leads
to the fault and how
to operate it. Specific
information can be seen
in table 5, table 6.
How to deal with Remarks
"1. Reconnect the wiring
of the sensor for the
expansion valve A (gas
pipe);
2. Replace the sensor
for the expansion valve
A (gas pipe);
3. Replace the outdoor
control board."
"1. Reconnect the wiring
of the sensor for the
expansion valve B (gas
pipe);
2. Replace the sensor
for the expansion valve
B (gas pipe);
3. Replace the outdoor
control board."
"1. Reconnect the wiring
of the sensor for the
expansion valve B (gas
pipe);
2. Replace the sensor
for the expansion valve
C (gas pipe);
3. Replace the outdoor
control board."
"1. Reconnect the wiring
of the sensor for the
expansion valve B (gas
pipe);
2. Replace the sensor
for the expansion valve
D (gas pipe);
3. Replace the outdoor
control board."
See attached "analysis
of the driving board
fault".