Kemper KHS CoolFlow 618 01 001 Manuel D'utilisation page 76

EN
Malfunction Possible cause
E03 Medium flow disturbance
Anti-freeze protection
E07
triggered
P81 Heat gas overtemperature
Heating system dropped
E44 below bottom operating
limit
E21 Low voltage fuse triggered
E22/23 Overflow protection
DC bus overvoltage
E24
protection triggered
Inverter board low voltage
E25
protection device triggered
E27 IPM overcurrent protection
E28 IPM overheating protection
Overheating of the control
E30 / E31
electronics
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Checks
Check:
- Air in the medium piping
- Open shut-off devices
- Medium pressure
- Circulation pump capacity
- Medium flow rate
- Flow monitor
Is the supply temperature
greater than or less than 4°C?
Check:
- Heat gas temperature (U04)
- Heat gas temperature
probe, probe resistance
- Refrigerant quantity
Outside temperature below
-20°C?
Check:
- Voltage on R/S/T on the
inverter board
(min 300V)
Check:
- Current consumption of the
complete system
Check:
- Voltage at R/S/T on the
inverter board
(max 500V)
- Voltage between DCP-IN
and DCN-IN on the inverter
board (max 800V)
Check:
- Voltage at R/S/T on the
inverter board
(min 210V)
- Voltage between DCP-IN
and DCN-IN on the inverter
board (min 300V)
Check:
Compressor current draw,
Pressure difference, high/low
pressure
Check:
- Function of the fan
- Air throughput
Check:
- Function of the fan
- Air throughput
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Remedial measures
- Bleed medium cycle
- Open shut-off valves
- Increase medium pressure
- Have circulation pump, medium
flow rate and flow monitor
checked by a specialist company.
Raise return flow temperature,
increase medium flow rate, adjust
anti-freeze temperature to the
operating medium.
- Replace heat gas temperature
probe
- Fill refrigerant to operational
levels after rectifying the cause of
the problem
Establish stable power supply on
the supply line
- Replace inverter board
- Restart system
Establish stable power supply on
the supply line
- Replace inverter board
Establish stable power supply on
the supply line
- Replace inverter board
- Reduce pressure difference
by raising the low pressure or
lowering the high pressure
- Ensure that there is adequate
distance at the fan inlet and
outlet
- Clean the finned heat
exchanger
- Ensure that there is adequate
distance at the fan inlet and
outlet
- Clean the finned heat
exchanger
Major
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