Defrost Fail Alarm; J3-16-22-28 - Discharge Thermistor R21T Open Circuit; J3-17-23-29 - Discharge Thermistor R21T Short Circuit; J3-18-24-30 - Discharge Thermistor R22T Open Circuit - Daikin VRV IV+ Service Manual

2 Troubleshooting
2.3.38 HA-00 – Defrost fail alarm
Trigger Effect
When outdoor unit Unit keeps running.
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" on
Possible cause: Insufficient air flow or air by‑pass due to
required space specifications not met.
2 Clean the outdoor heat exchanger. See
page 140.
Possible cause: Dirty outdoor heat exchanger.
3 Check if the refrigerant circuit is correctly charged. See
"4.2 Refrigerant circuit" on page 133.
Possible cause: Refrigerant shortage.
4 Perform a check of
"3.17 Thermistors" on page 128.
Possible cause: Faulty de–icer thermistor or connector fault.
5 Perform a check of the refrigerant high pressure sensor. See
"3.15 Refrigerant high pressure sensor" on
Possible cause: Faulty refrigerant high pressure sensor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.39 J3-16-22-28 – Discharge thermistor R21T
open circuit
Main error code Sub error code
J3 16
22
28
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 Effect
Compressor (M1C) Unit will stop
discharge thermistor operating.
R21T open circuit or
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 discharge pipe thermistor. See
"3.17 Thermistors" on page 128.
Possible cause: Faulty discharge pipe thermistor or
connector fault.
Service manual
28
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
Reset
Auto reset.
page 138.
"5 Maintenance" on
the de–icer thermistor.
page 124.
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
Automatic reset when
thermistor read-out is
within range.
2 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.40 J3-17-23-29 – Discharge thermistor R21T
short circuit
Main error code
J3
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
See
Compressor (M1C)
discharge thermistor
R21T short circuit or
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 discharge pipe thermistor. See
"3.17 Thermistors" on
Possible cause: Faulty discharge pipe thermistor or
connector fault.
2 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.41 J3-18-24-30 – Discharge thermistor R22T
open circuit
Main error code
J3
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.
"3.9 Main PCB" on
Sub error code Unit
17 Main
23 Sub 1
29 Sub 2
Effect Reset
Unit will stop Manual reset via user
operating. interface.
Automatic reset when
thermistor read-out is
within range.
page 128.
"3.9 Main PCB" on
Sub error code Unit
18 Main
24 Sub 1
30 Sub 2
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07