Dealing with malfunctions
Dealing with malfunctions
Low temperature or a lack of hot water
Note! The hot water capacity can be increased for 24 hours
by pressing in the button (18).
Large amounts of hot water were used.•
Circuit or main MCB tripped.•
Possible earth circuit-breaker tripped.•
Switch (8) set to “0”.•
MCB (7) tripped. See the section “Service” – •
“Resetting the miniature circuit breakers”.
Closed or throttled filler valve (46) on the water heater.•
Thermostat backup heating set too low (3).•
Drying process for floor heating is activated.•
Low or no ventilation
Defrosting mode, lamp (31) illuminates continuously•
Filter (63) clogged (possibly replace).•
Exhaust air device blocked or throttled down too •
much.
Circuit or main MCB tripped.•
Possible earth circuit-breaker tripped.•
MCB (7) tripped. See the section “Service” – •
“Resetting the miniature circuit breakers”.
Drying process for floor heating is activated.•
Low room temperature
Circuit or main MCB tripped.•
Possible earth circuit-breaker tripped.•
MCB (7) tripped. See the section “Service” – •
“Resetting the miniature circuit breakers”.
Tripped temperature limiter (6). (Contact service)•
Automatic heating control system settings not correct •
(40).
Circulation pump (16) stopped. See the section •
“Dealing with malfunctions” – “Help starting the cir-
culation pump”.
Air in boiler or system. •
Close valve (44) and/or (50) in the radiator circuit.•
Initial pressure in expansion vessel too low. This is •
indicated by low pressure on the pressure gauge (42).
Contact the installer.
Thermostat backup heating set too low (3).•
Clogged particle filter (100).•
Drying process for floor heating is activated.•
High room temperature
Automatic heating control system settings not correct.•
Drying process for floor heating is activated.•
Switch position
The compressor and electronic controls of the
heat pump are off.
The numerical display is off, FIGHTER 640P
does not produce hot water.
The fan is operational and the immersion heater is control-
led by a separate thermostat (3). When floor heating is
installed the cut-out temperature on the thermostat should
be lowered to prevent damage to the floor. The thermostat
should be reset once the malfunction has been rectified.
Resetting pressostats
To reset a tripped pressure switch, press the button on the
top of it; see diagram. The pressostats are located behind
the upper service cover.
If the operating disturbance cannot be rectified by means of the above an installation
engineer should be called.
If necessary set the switch to .
In the event of malfunction or operating disturbances first check the points below:
Low pressure pressostat
Normally this switch resets automatically so it does not
have a reset button.
High pressure pressostat
Work behind covers secured by screws may
only be carried out under the supervision
of a qualified installation engineer.
Note!
3
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