Friedrich FPHMR18A3A Service Manual page 84

Outdoor Fault Codes
Fault code Fault description
17 Discharge temperature
sensor fault
18 AC voltage is abnormal
19 Suction temperature
sensor fault
22 The defrosting sensor fault
23 Expansion valve A tube
(thin) sensor fault
24 Expansion valve B (thin)
tube sensor fault
25 Expansion valve C (liquid)
pipe sensor fault
26 Expansion valve D (liquid)
pipe sensor fault
84
TROUBLESHOOTING
Possible reasons for
abnormality
"1.The wiring of the discharge
temperature sensor is
connected loosely;
2.The discharge temperature
sensor fails;
3.The sampling circuit is
abnormal."
1.The AC voltage>275V or
<160V.
2.The AC voltage of sampling
circuit on the driver board is
abnormal.
"1.The wiring of the suction
tempe‑ rature sensor is
connected loosely;
2.The suction temperature
sensor fails;
3.The sampling circuit is
abnormal."
"1. The wiring of the defrosting
sensor
is connected loosely;
2. The defrosting sensor fails;
3. The sampling circuit is
abnormal."
"1. The wiring of the sensor
for the expansion valve A(thin
tube) connect loose;
2. The sensor for the
expansion A(thin tube) is
failure;
3. The sampling circuit is
abnormally"
"1. The wiring of the sensor
for the expansion valve B (thin
tube) connect loose;
2.The sensor for the expansion
valve B(thin tube) is failure;
3.The sampling circuit is
abnormally"
"1. The wiring of the sensor for
the expansion valve C (liquid
pipe) is connected loosely;
2. The sensor of the expansion
valve C (liquid pipe) fails;
3. The sampling circuit fails."
"1.The wiring of the sensor for
the expansion valve D (liquid
pipe) is connected loosely;
2.The sensor of the expansion
valve D (liquid pipe) fails;
3.The sampling circuit fails."
How to deal with
"1. Reconnect the wiring of
the discharge temperature
sensor;
2. Replace the discharge
temperature sensor fails;
3. The sampling circuit is
abnormal."
"1. Normal protection,
please check the supply
power;
2. Replace the driver board."
"1. Reconnect the wiring
of the suction temperature
sensor;
2. Replace the suction
temperature sensor;
3. Replace the outdoor
control board."
"1. Reconnect the wiring of
the defrosting sensor;
2. Replace the defrosting
sensor;
3. Replace the outdoor
control board."
"1. Reconnect the wiring of
the sensor for the expansion
valve A (thin tube);
2. Replace the sensor for
the expansion valve A (thin
tube);
3. Replace the outdoor
control board."
"1. Reconnect the wiring of
the sensor for the expansion
valve B(thin tube);
2.Replace the sensor for
the expansion valve B(thin
tube);
3. Replace the outdoor
control board."
"1. Reconnect the wiring of
the sensor for the expansion
valve C (liquid pipe).
2. Replace the sensor for the
expansion valve C (liquid
pipe);
3. Replace the outdoor
control board."
"1. Reconnect the wiring of
the sensor for the expansion
valve D (liquid pipe);
2. Replace the sensor for the
expansion valve D (liquid
pipe);
3. Replace the outdoor
control board."
Remarks