Switching Off; Gas Operation Fault; Electrical Operation Fault; Filling The Water Heater - Truma Combi 4 E Mode D'emploi

– Heating without water temperature monitoring
Select gas, electrical or mixed operation using the power
switch. Illumination of the yellow LED (g) on the power
selector switch indicates that the unit is operating with 230 V.
Move rotary switch on control panel to operating position (m).
Turn the rotary switch (h) to the desired thermostat setting
(1 – 5). The green LED (k) for operation is lit and simultane-
ously indicates the position of the selected room tempera-
ture. The yellow LED (p – water's heat-up phase) will be lit
only when the water temperature is below 5 °C!
The device automatically selects the required power setting
in accordance with the temperature difference between the
temperature selected on the control panel and the current
room temperature. Once the room temperature selected on
the control panel has been reached, the heater switches off.
The warm air fan continues to run at slow speed until the out-
going air temperature (on the unit) has fallen to 40 °C or less.
If the boiler is filled, the water will automatically be heated
at the same time. The water temperature is then dependent
on the heating output being given off, and the duration of
heating required to reach the desired room temperature.
– Heating with drained water system
Select gas or electrical operation using the power selector
switch. Illumination of the yellow LED (g) on the power
selector switch indicates that the unit is operating with 230 V.
Move rotary switch on control panel to operating position (m).
Turn the rotary switch (h) to the desired thermostat setting
(1 – 5). The green LED (k) for operation is lit and simultaneously
indicates the position of the selected room temperature. The
yellow LED (p) will be lit only when the temperature of the
unit is below 5 °C!
Depending on the operating mode, the unit will automatical-
ly select the required power level according to the tempera-
ture difference between the setting on the control panel and
the current room temperature. Once the room temperature
selected on the control panel has been reached, the heater
switches off. The warm air fan continues to run at slow
speed until the outgoing air temperature (on the unit) has
fallen to 40 °C or less.

Switching off

Switch off heater at control panel using rotary switch (position o).
The green LED (k) goes off.
If the green LED (k) blinks after switching off, then the
unit's after-running is active in order to reduce the unit's
temperature. This will end after a few minutes and the green
LED (k) will go off.
Always drain water contents if there is a risk of frost!
If the appliance is not to be used for a prolonged period, close
the quick-acting valve in the gas supply line and turn off the
gas cylinder.
16

Gas operation fault

If a fault occurs during gas operation the red LED (r) on the
control panel illuminates.
Please consult the Trouble-Shooting list for possible causes.
A reset (fault reset) is carried out by switching off, waiting
until all LED's on the control panel have stopped flashing, and
then switching the heater on again.
If a window to which a window switch has been fitted is
opened, the heater stops operating and the red LED (r)
flashes. The heater continues operating when the window is
closed.

Electrical operation fault

If a fault occurs during electrical operation the yellow indicator
lamp (g) on the power selector switch goes off.
Possible causes can be found in the troubleshooting list.
If the 230 V power supply is interrupted for just a brief
period of approximately 1 second during operation, the
heater will subsequently resume as normal.

Filling the water heater

Check if the rotary switch for the drain valve (FrostControl) is
set to "Operation", meaning that it is parallel to the water
connection and engaged.
Close the drain valve by pushing the push button until it
engages.
When the temperature at FrostControl is below about
7 °C, first switch on the heater to warm the installation
compartment and FrostControl. After several minutes, when
the temperature at FrostControl is above 7 °C, the drain valve
can be closed.
Switch on power for water pump (main or pump switch).
Open hot water taps in kitchen and bathroom, (set preselect-
ing mixing taps or single-lever fittings to "hot"). Leave the fit-
tings open for as long as it takes for the boiler to displace the
air and fill up, and the water to flow without interruption.
If just the cold water system is being operated, without
using the water heater, the heater tank also fills up with
water. To avoid frost damage, the boiler must be drained
through the drain valve, even if it was not operated.
When connecting to a central water supply (rural or city
mains), a pressure reduction valve must always be in-
stalled to prevent pressures above 2.8 bar from developing in
the water heater.

Draining the water heater

Switch off power to water pump (main or pump switch).
Open hot water taps in kitchen and bathroom.
In order to check the water that is flowing out, place an
appropriate container (capacity 10 litres) beneath the drain
valve (FrostControl) drainage muff (x).
Turn the rotary switch on the drain valve by 180° until it
engages, whereby the push button moves out and the drain
valve opens.
Check whether all of the water in the boiler (10 litres) has
been drained into the container via the drain valve.
There shall be no claims under guarantee for damage
caused by frost!