Daikin FTXP20-71L, Service Manual

Page: 19 / 192

2 | Troubleshooting
Service manual
19
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
5 Wait until the rectifier voltage is below 10 V DC.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
6 Check that the thermal interface grease is applied properly on the (PCB or
refrigerant piping) contact surface of the heat sink. Adjust if needed.
Possible cause: Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.5.7 E3-00 – Outdoor unit: Actuation of high pressure switch
Trigger Effect Reset
High pressure switch
opens due to measured
pressure above high
pressure switch operating
point. Unit will stop operating. Manual reset via user
interface.
High pressure control
(measured pressure just
below high pressure
switch operating point)
occurs 16 times within
300 minutes.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check that all stop valves of the refrigerant circuit are open. See
"4.2 Refrigerant circuit" [
4
144].
Possible cause: Closed stop valve in the refrigerant circuit.
2 Perform a check of the high pressure switch. See "3.4 High pressure
switch" [ 4 72].
Possible cause: Faulty high pressure switch.
3 Perform a check of the main PCB. See "3.7 Main PCB" [
4
84].
Possible cause: Faulty main PCB.
4 Check if the refrigerant circuit is correctly charged. See "4.2 Refrigerant
circuit" [
4
144].