E3-00 - Outdoor Unit: Actuation Of High Pressure Switch - Daikin RXM20R Service Manual

3 | Troubleshooting
3.5.9 E3-00 – Outdoor unit: Actuation of high pressure switch
Service manual
22
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.
Trigger
High pressure switch
opens due to measured
pressure above high
pressure switch operating
point.
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
"5.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
2 Perform a check of the high pressure switch. See
4
switch" [ 89].
Possible cause: Faulty high pressure switch.
3 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
4 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 207].
Possible cause: Refrigerant overcharge.
5 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
Effect
Unit will stop operating.
4
207].
"4.12 Main
"5.2 Refrigerant circuit" [
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
Reset
Manual reset via user
interface.
"4.6 High pressure
4
PCB" [ 125].
"5.2 Refrigerant
4
207].
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02