“Regumaq X-25” Troubleshooting
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138112581-V01.10.2019
9. Troubleshooting
9.1 Troubleshooting table
MALFUNCTION
CAUSE
REMEDY
The display is permanently off.
The controller is in standby mode.
Press a button to activate the dis-
play.
The power supply to the controller is
interrupted.
Connect the power supply.
The controller fuse is defective.
Replace the fuse (see section 8.5 on
page 35).
There are audible pump noises and
noises that arise due to airlocks.
The system has not been bled.
Bleed the system (see section 7.1 on
page 28 for the storage cylinder
circuit and section 7.2 on page 29
for the potable water circuit).
The potable water is not heated.
Only cold water is available at the
draw-off points.
The flow sensor is soiled or defective.
Clean the flow sensor or replace a
defective flow sensor (see …
The controller is not in operation
(deactivated).
Check the controller power supply
and restore it if necessary.
Replace the fuse if necessary (see
section 8.5 on page 35).
There is an airlock in the storage
cylinder circuit.
Check the bleeders in the storage
cylinder circuit for correct position,
function and open position.
The circulation pump in the storage
cylinder circuit is defective (no pump
operation for drawing off hot water).
Replace the circulation pump in the
storage cylinder circuit.
The hot water temperature drops
at the draw-off point(s).
The heating water temperature in the
buffer storage cylinder is too low.
- Increase the buffer storage cylin-
der temperature.
- Check the capacity of the heat
generator.
Insufficient storage cylinder capacity.
- Increase the storage cylinder
capacity.
- Check the system design.
The water at the draw-off point
cools down suddenly during circu-
lation operation.
Cold water enters the circulation pipe
directly and not the heat exchanger.
The check valve for the circulation
pipe (accessory) is soiled or defec-
tive.
Clean the check valve or replace it.
The target temperature is no longer
reached if draw off quantities are
higher.
The storage cylinder temperature
is too low for the required draw off
quantity.
Increase the heating water tempera-
ture in the buffer storage cylinder.
The heat exchanger is soiled.
Clean the storage cylinder circuit
side of the heat exchanger.
The heat exchanger is calcified.
Decalcify the potable water side of
the heat exchanger.
