9
en
4 Non-return valve
The non-return valve is located above the pump in the return line.
5 Maintenance
In order to remove limescale, we recommend cleaning the heating element and the
throttle orice annually.
ATTENTION! Damage caused by improper cleaning uids!
Using cleaning uids not suited for high-grade steel, copper or
nickel can damage the heating element!
ÎUse cleaning uids according to the manufacturer’s
instructions only.
For the cleaning uid, use chloride-free or low-chloride water
with low hardness.
Cleaning the heating element
In order to clean the heating element, carry out the following steps:
ÎRemove the heating element.
ÎFlush the heating element with appropriate cleaning uid against the normal
ow direction.
ÎFlush the cleaned heating element and the system with clear water.
Cleaning the throttle orice
ÎIn order to clean the throttle orice, close both ball valves.
A B
ÎRemove the lateral cover (A) at the ball valve in the ow and clean the throttle
orice (B).
6 Troubleshooting
If an error has occurred, it will be indicated on the controller screen.
Please pay attention to the controller manual!
Fault condition Possible cause Elimination
Pump noise Air inside the system Vent the system
Flow rate too low
(ΔT too high)
Water pressure too low Check and increase pressure
if necessary
Heat exchanger calcied Decalcication / replacement
Throttle orice polluted Clean throttle orice, see
maintenance
Non-return valve blocked
(error message = red LED at
pump head)
Control pump at 10% speed
in manual operation
Target tempera-
ture not reached
Incorrect controller adjust-
ment
Check adjustments
Heating element
does not heat
Controller not in operation Check controller
Temperature sensor not cor-
rectly connected or defective
Check or replace, if necessary
Pump defective Check or replace, if necessary
Thermal cut-out triggered Reset (below black cover in
DeltaTherm®E Power)
