Technical
Information
no.
912-100-0123
page
8/8
10 Fault diagnosis
Fault Cause Remedy
No air flow
Fuse defective or loose Check the seating of the fuse? If
necessary insert correctly. Renew
defective fuses.
Interruption of line Test lines on loose contacts or breaks
Blower motor defective replace motor
switch for blower defective change operation element
Mini will not operate
at all speeds (2-
speed versions)
Micro-temperature fusing (MTF)
has been triggered
Exchange resistor and check the blower
motor for the cause of functional faults
Switch for blower defective
change operation element
Connecting plug has become
loose
Check plug connection of unit for proper
seating. If not assemble it correctly
Check connection on switch
Resistor defective Exchange resistor
No or insufficient
heating power
Water supply temperature to
low
Wait until the motor is warm
Water valve will not open fully Check & renew water valve if necessary
incl. actuation operation, check flow
direction
Heat exchanger fins
contaminated
Check heat exchanger and clean it if
necessary
Water lines kinked or squashed
Eliminate fault by installing correctly
Water escaping from
the unit
Hose connection has come
loose
Check hose seatings and tighten hose
clamps
Water hose damaged Install and connect new hose
Heat exchanger damaged Install and connect original replacement
part. Warning! Follow safety
instructions!
coolant system pressure too
high
reduce absolute coolant pressure
max. allowable pressure: 2 bar
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