Air-to-water Heat Pump
69
MONOBLOC
TYPE
(7) Under-voltage Protection of DC bus
No
No
No
Yes
Yes
Yes
Yes
No
E5 is displayed
on the wired
controller.
Monitoring
display
Nixie tube on
the mainboard
PL is displayed.
Lack of voltage
protection
Is the input voltage
in the range of
185~264VAC?
Does it occur during
operation of the
compressor?
Does it occur 6 times
within 1 hour?
Does it occur when
the compressor starts?
It is recorded and
reflected.
Replace the mainboard. Input voltage is too low.
Pleasecheck if the diameter
of the power cord is qualifed
or if the power cord is too long.
Voltage of the power system is
too low and please cut off the
power. Do not turn on the unit,
as the unit might be damaged
or it would lead to fire accident.
It is caused by interference.
Please find out the
interference source
and take corrective
measures.
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