Air-to-water Heat Pump
63
MONOBLOC
TYPE
is detected higher than 105°C. If the protection occurs for 6 times within one hour, it can not be resumed
unless it is deenergized and reenergized.
(7) Abnormal sensor of radiating n: The protection occurs when break circuit or short circuit of the temperature
sensor on top of the IPM module. If the protection occurs for 6 times within one hour, it can not be resumed
unless it is deenergized and reenergized.
(8) Communication error of conversion driver and main controller: the driving board can not communicate with
the main controller normally. This error can be resumed automatically.
19.6.4 Diagnosis owchart of the driving board
(1) PFC abnormality
E5 is displayed
on the wired
controller.
PFC error
Monitoring
display
Nixie tube of
the mainboard
Hc is displayed.
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？
Replace the mainboard.
It is recorded.
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.
Is IPM module
of the mainboard
damaged?
Is +15V of the
mainboard stable?
15VA-pin 1, 2
No
No
No
Yes
Yes
Yes
Yes
No
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