Table 11.
Problem – Alarm electric heater error
Cause
Troubleshooting
Remedy
1. The overheating protection has trip-
ped.
Check if the overheating protection has
tripped.
If the overheating protection has trip-
ped, reset it.
2. Phase drop.
The alarm occurs when 230 V is not
registered between L2 on the circuit
board and N. Does not apply if MAX
STEP = P.
•
Check if the overheating protection
has tripped.
•
Check if any cables at the circuit
board or overheating protection are
loose or damaged.
If the overheating protection has trip-
ped, reset it.
If the cables are loose or damaged,
secure or replace them.
3. Overheating protection fault, cannot
be reset.
Press the reset button, measurement
check for 230 V on the incoming and out-
going connections.
If the overheating protection is defec-
tive, replace it.
4. Flow sensor fault.
Check what the flow sensor shows. Is it a
plausible/actual value?
Measure the resistance of the sensor,
check against the ohm table in Measure-
ment points, Page 11.
If the sensor is defective, replace it.
5. No or insufficient circulation in the
heating system.
Check:
•
That the circulation pump spins
•
That the shut-off valves are open.
•
That the strainer is not blocked.
•
That there is no air in the heating sys-
tem.
The circulation pump may have jam-
med. If so, open the bleed screw and try
to release the paddle wheel using a
screwdriver for example.
Open closed valves or taps.
Check, and, if necessary, clean the
strainer.
If necessary, bleed the heating system
according to the installation instructions
Table 12.
Problem – Alarm circulation pump
Cause
Troubleshooting
Remedy
The circulation pump’s integrated
alarm has deployed. (Only applies to
Opti)
•
Air in the heating system.
•
Has the circulation pump jammed?
Vent the heating system and TWS coil.
If the circulation pump has jammed,
there is an integrated shake function
that attempts to shake itself loose up to
a maximum of 5 times, if it does not suc-
ceed, an alarm will occur.
Try cutting the voltage to the heat pump
to stop the alarm and then manually run
the circulation pump.
If the alarm recurs, repeat the procedure
several times. If this does not help,
replace the circulation pump.
Service instructions VMGFJ102 – 19
