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FOR THE USER
Motor cut-out compressor (MB1)
Possible cause 1: Intermittent fault or overload on the power
supply.
Action: 1. Press the Ackn. button.
The alarm indication goes out even if the fault has
not been rectifi ed.
2. Press in the motor cut-out button on the heat
pump. (Fuse 1).
3. Wait for the heat pump to start.
Possible cause 2: Current level (A) on the motor cut-out is set too
low.
The current drawn by the compressor varies during
summer/winter operations.
Action: 1. Contact your dealer.
Possible cause 3: Contactor or cut-out faulty, or loose electrical
connections to the compressor.
Action: 1. Contact your dealer.
Possible cause 4: Compressor error.
Action: 1. Contact your dealer.
Motor cut-out HTF pump (MB2)
(Applies to models C11, E11, E14 and E17)
Possible cause 1: The HTF pump is blocked due to contamination.
Action: 1. Press the Ackn. button.
2. Loosen the venting screw and remove the dirt.
3. Help to start the pump with a screwdriver.
The alarm indication goes out even if the fault has
not been rectifi ed.
Possible cause 2: Faulty electric motor on HTF pump.
Action: 1. Contact your dealer.
Possible cause 3: Temporary error.
Action: 1. Contact your dealer should repeated faults occur.
The menu display shows:
What to do if a fault occurs
ALARM (MB1)
Compr. circ. Switch
040622 16:08:15
Info Ackn.
The menu display shows:
ALARM (MB2)
HTF c-pump switch
040622 16:08:15
Info Ackn.
The reset switch for the compressor
can be found under heading Fuses
and resetting buttons on the heat
pump.
Note
The alarm indication goes out when
acknowledging the alarm even if the
fault has not been rectifi ed.
Note
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