Air-to-water Heat Pump
64
MONOBLOC
TYPE
(2) IPM protection
The reasons may be:
•
Untight screws of IPM module
•
damaged IPM module
•
defective radiating of IPM module
•
abnormal +15V power strip
•
abnormal PFC module
•
wire connection error with PFC
•
wrong cement resistance RS1-RS3 of driving board
•
abnormal compressor
•
interference
Monitoring
display
Nixie tube of
the mainboard
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
1. If it is affected by damp, find out the
reason and take some precautionary
measures. After drying the mainboard,
brush it with damp-proof gum water.
2. If it is polluted, find out the reason
and protect it from dust. If the
environment is bad, clean the dirt
periodically.
3. If it is short-circuited, find out the
reason and clean the electric box so
as to prevent the conductive matter such
as iron chipings adhering on the board.
It is recorded.
H5 is displayed.
IPM protection
E5 is displayed
on the wired
controller.
Inspect the mainboard
1 minute after power off
or the bus voltage is
below 36V.
Is it wet, dirty or
short-circuited?
Dry and clean it
or remove the
short circuit.
Restart the unit.
Does it work
normally？
Is the compressor
wire loose or is
phase sequence
incorrect?
Is +15V of the
mainboard stable?
15VA-pin 1, 2
Is IPM module
of the mainboard
damaged?
Replace the
mainboard.
Tighten the
compressor wire or
adjust the phase
sequence.
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