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INSTALLATION
MAINTENANCE AND CLEANING
14.2 Troubleshooting
14.2.1 Excessive power consumption
» Lower the temperature of the booster heater.
14.2.2 The room temperature falls excessively
One possible cause is an inadequate air flow over the
evaporator.
» Check the fan.
» Check for clogged evaporator.
» Ensure that the intake and discharge flow are not
restricted.
15. Maintenance and cleaning
Only qualified licensed installers must carry out
maintenance work in accordance with these instructions.
WARNING Electric shock
Maintenance work, such as checking the
electrical safety, must only be carried out by
an electrician. Always disconnect the power
supply before working on the water heater.
15.1 Cleaning the evaporator
WARNING Injury
The evaporator has many sharp-edged fins.
When cleaning the evaporator, proceed with
caution and wear protective clothing, in
particular safety gloves.
Maintaining the full output of the water heater at all
times requires an occasional professional cleaning of
the evaporator.
» Undo the screws that connect the water heater
cover and remove.
» Carefully clean the evaporator fins. Only use water
and a soft brush. Never use acidic or alkaline
cleaning agents.
15.2 Draining the tank
WARNING Scalding
Hot water can be expelled when draining the
tank.
» Close the shut-off valve in the cold water line.
» Fully open the hot faucets at all points.
The tank is drained via the cold water supply. Some
residual water will remain in the bottom of the tank.
» Open the drain valve (see chapter 10.7, "Water
connection").
If a drain valve was not installed, undo the fitting on the
cold water supply of the water heater.
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