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13 Trouble shooting
NOTE:
Only instructed persons are allowed to correct failures and to change the settings The controller basic ad-
justment takes place in the context of commissioning via the specialist! For
possible corrections and program attitudes the operator/responsible person is responsible!
Malfunction/display
Cause
Correction
Heating system is not warm, heat
pump is hot up to buffer/header tank
Energy dissemination is interrupted or
insufficient
Replace circulation pump, bleed
heating circuit, open valves, open
regulating fittings, increase the
power stage on circulation pump.
Heat pump running
Heating performance too low
Heat load too high
Reduce heat load
Heat source system overloaded
Reduce heat load
Heat pump is switched to boiler priority
Check heat pump control settings
Building design condition (e.g. building
insulation) not established
Achieve design conditions
Heat pump heats only hot water and
does not heat, or heats too late
Hot water desired setting is too high
Reduce switch off point
Control set to summer operation
Set control to heating mode
Hot water heat exchanger too small
Increase heat exchanger size
Hot water heat exchanger chalked up
Contact heating installer, clean and
decalcify heat exchanger
Hot water temperature not reached
or no longer reached
Hot water heat exchanger too small
Increase heat exchanger size
Heat exchanger is chalked up
Decalcify heat exchanger
Wrong sensor positioning
Correct positioning
Pipework to small
Fit larger pipes
Hot water sensor defect
Replace
Hot water charge pump defect
Replace
Water charge pump performance stage
too low
Set performance stage higher
3-way valve defect
Replace
Heat pump runs continuously and
only provides low temperatures,
traces of oil in appliance
Refrigerant outlet
screw fittings are loose
Refrigerant pipework leaking
Switch off heat pump, contact cus-
tomer service
Utility black-out condition
A utility black-out is active
Flow rate too low (Er 91)
The min. flow rate not reached on the
heat pump.
Buffer charge pump defect
diverter valve defect (hot water,
possibly cooling buffer)
system pressure too low
Flow sensor defect
No hot water or heating system re-
mains cold.
No power to appliance
Check circuit breakers in house
installation. Reset circuit breakers if
necessary. If circuit breaker triggers
once more, contact your specialist
installer.
Water leaks from appliance
The condensate drainage could
be blocked.
Call your installer to clean the con-
densate drainage.
Condensate collects on the outside
The drying-out phase of the building has Condensate on the appliance
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