Daikin EBLA04E V Series, Service Manual, Page: 44 / 324

3 | Troubleshooting
Service manual
44
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
3.3.37 E4-00 – Abnormal suction pressure
Trigger Effect Reset
Suction pressure was too
low (detected by
thermistor/pressure
sensor or low pressure
switch) for several times. Unit will stop operating. Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of the suction pipe thermistor. See
"4.19 Thermistors" [
4
217].
Possible cause: Faulty suction pipe thermistor or connector fault.
2 Check that all stop valves of the refrigerant circuit are open. See
"5.2 Refrigerant circuit" [
4
256].
Possible cause: Closed stop valve in the refrigerant circuit.
3 Check if the refrigerant circuit is correctly charged. See "5.2 Refrigerant
circuit" [ 4 256].
Possible cause: Refrigerant shortage.
4 Check for the presence of humidity in the refrigerant circuit. See
"5.2 Refrigerant circuit" [
4
256].
Possible cause: Humidity in the refrigerant circuit.
5 Check if the refrigerant circuit is clogged. See "5.2 Refrigerant circuit" [
4
256].
Possible cause: Clogged refrigerant circuit.
6 Perform a check of the expansion valve. See "4.9 Expansion valve" [ 4 162].
Possible cause: Faulty expansion valve.
7 Check the required space around the outdoor unit heat exchanger. See
"5.5 External factors" [
4
274].
Possible cause: Insufficient air flow or air by‑pass due to required space
specifications not met.
8 Clean the outdoor heat exchanger. See "6 Maintenance" [
4
275].
Possible cause: Dirty outdoor heat exchanger.
9 Perform a check of the main PCB. See "4.14 Main PCB" [
4
184].
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
draft – 31/05/2022 15:53