56
Failure code
LD
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
definition
Failure description
Remarks
34-0
22
Discharging
temp.
over heat
protection
(Tdi)
Tdi / Td1≥130°C (E). Stop and alarm if it is
over the set value for 2 secs continuously
at interval of 25msec.
Resume automatically if the discharging
temp. is 10 degree lower than the alarm
condition after stopped for 3 mins.
Four times an hour, failure confirmed.
Once
confirmation,
Un-
Resumable
35-0
23
4WV
reversing
failure
Reversion is successful if the following
condition is satisfied for continuous 10 secs
after 4WV is electrified for 30sec.
Tsuc/B-Tsuc/A≥10°C or Pd-Ps 30sec after
4WV ON minus the minimum of Pd-Ps from
4MV ON to 15sec ≥ 0.2MPa.
If not satisfied, protect and stop.
* 4WV OFF restart after 3 mins
* Thermo OFF for 2 times in one hour
continuously, Error and stop
Once
confirmation,
Un-
Resumable
35-1
23
4WV
reversing
failure
Master unit checks heating mode operation.
If some slave units’ 4WV still can’t
electrified after starting up for 20 mins,
failure 35-1 is shown.
36
24
Oil temp.
sub-cooling
protection
(Toili)
Normally in operation (excluding startup,
deforest, oil return, remains, stop), detect
Toil < CT+10°C for continuous 5 mins, stop
and alarm. Resume automatically after 170
secs; Lock if alarming three times an hour.
The same as Td sub-cooling protection
Once
confirmation,
Un-
Resumable
37-0
25
Default phase
of 3-phase
power supply
or phase
sequence
error
S phase default
Once
confirmation,
Un-
Resumable
37-1
25
T phase default
37-2
25
S phase and T phase are normal ,but
sequence (phase reversion) is wrong
39-0
27
Low pressure
sensor Ps
protection
against too
low pressure
After compressor starts up (excluding the
remains operation), too low pressure is
detected for 5 mins continuously (cooling: Ps<
0.10MPa; heating: Ps< 0.55MPa; oil return:
Ps<0.03MPa), stop and alarm. Resume
automatically after 170 secs. Three times an
hour, failure confirmed.
Once
confirmation,
Un-
Resumable
