Daikin VRV IV+ Service Manual page 58

2 | Troubleshooting
2.3.36 F3-20-21-22 – Compressor body temperature too high
Service manual
58
2 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty discharge pipe thermistor or connector fault.
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" [ 363].
Possible cause: Refrigerant shortage.
5 Perform a check of the compressor. See "3.3 Compressor" [
Possible cause: Faulty compressor.
6 Perform a check of the lower heat exchanger expansion valve. See
"3.7 Expansion valve" [
Possible cause: Faulty lower heat exchanger expansion valve.
7 Perform a check of the upper heat exchanger expansion valve. See
"3.7 Expansion valve" [
Possible cause: Faulty upper heat exchanger expansion valve.
8 Perform a check of the expansion valve(s) of the indoor unit(s). See service
manual of the respective indoor unit(s) for more information.
Possible cause: Faulty indoor unit expansion valve.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
F3
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Body temperature >safety
value certain times within
certain minutes, see
"6.6 Safety
4
devices" [ 449].
of the discharge
4
348].
"3.11 Main
4
244].
4
244].
Sub error code
20
21
22
Effect
Unit will stop operating.
pipe thermistor.
4
PCB" [ 290].
"4.2 Refrigerant
4
221].
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
Automatic reset when
body temperature <reset
value, see "6.6 Safety
4
devices" [ 449].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
See