Gree GRS-CQ8.0Pd/NhG3-E - Page 72

Air-to-water Heat Pump
68
MONOBLOC
TYPE
(6) Overvoltage protection of DC bus
No
No
No
No
Yes
Yes
Yes
Yes
E5 is displayed
on the wired
controller.
Monitoring
display
Nixie tube of
the mainboard
Overvoltage
protection of the
DC bus
PH is displayed.
Is input voltage within
the running range
(185~264VAC)?
Does it occur during
operation of the
compressor?
Does it occur 6 times
within i hour?
Does it occur during
frequency drop of the
compressor?
Replace the mainboard.
It is recorded and
reflected.
It is caused by
interference. Inspect the
wiring or interference
source. Take actions to
prevent interference.
It is caused by slowdown
of the compressor. If it
always happens, inspect
the compressor.
The voltage is too high.
Please cut off the power
immediately in case of
damaging the unit or
causing fire accident.