Daikin VRV IV+ Service Manual page 79

2.3.56 HA-00 – Defrost fail alarm
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Trigger
Ambient temperature
thermistor R1T read-out is
out of range.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of the outdoor air thermistor. See "3.21 Thermistors" [
Possible cause: Faulty ambient air thermistor.
2 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
When outdoor unit judges
defrost is not completed.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check the required space around the outdoor unit heat exchanger. See
"4.3 External factors" [
Possible cause: Insufficient air flow or air by‑pass due to required space
specifications not met.
2 Clean the outdoor heat exchanger. See "5 Maintenance" [
Possible cause: Dirty outdoor heat exchanger.
3 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant shortage.
4 Perform a check of the de–icer thermistor. See "3.21 Thermistors" [
Possible cause: Faulty de–icer thermistor or connector fault.
5 Perform a check of the refrigerant high pressure sensor. See
high pressure sensor" [
Possible cause: Faulty refrigerant high pressure sensor.
Effect
Unit will stop operating.
"3.11 Main
Effect
Unit keeps running.
4
372].
4
330].
2 Troubleshooting
|
Reset
Manual reset via user
interface.
Automatic reset when
thermistor read-out is
within range.
4
348].
4
PCB" [ 290].
Reset
Auto reset.
4
374].
"4.2 Refrigerant
4
348].
"3.17 Refrigerant
Service manual
79