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DHW mode
Faults / Fault codes
3062348_0511
Information for energy-efficient
operation
Keep the heat inside the room - at night too
At night, closing shutters and drawing curtains noticeably reduces heat loss via the
window areas. Insulating the radiator recesses and light coloured paintwork can reduce
your heating bills by up to 4%. Airtight joints at windows and doors also help to keep
energy inside the room.
Minimise energy loss through sensible ventilation
Ventilating for hours loses heat stored in walls and objects. As a result, the ambient
climate will only become comfortable again after prolonged heating. Short and thorough
airing is more effective and pleasant.
Venting the radiators
Regularly vent the radiators in every room. This safeguards the perfect function of
radiators and thermostats, particularly in the upper apartments of apartment blocks.
The radiator will then be able to respond quickly to changing heat demands.
Intelligent use of DHW circulation pumps
Always control DHW circulation pumps via time switches. Program these in accordance
with your DHW demand patterns.
The optimum DHW temperature
Only ever set the DHW temperature, or that of the cylinder, to the temperature you
really require. Any additional heating uses additional energy.
When the hardness of the water is over 15°d.H. (2.5 mol/m³) the DHW temperature
may be set to a maximum of 55 °C. This corresponds without accessory controller to a
setting of 5-6 on the DHW temperature selector with gas combi boilers, or 6-7 on gas
boilers with cylinders. The actual temperature then falls between 50 °C and 55 °C.
Sensible handling of DHW
Showering consumes only approx. 1/3 of the water volume required for a bath.
Immediately repair any dripping taps.
If the illuminated ring of the status indicator flashes red, where possible read the fault
code of the connected controller and note the code. The boiler can be restarted by
pressing the reset button. In case of repeated faults, switch OFF the boiler and notify
your heating contractor.
Gas boilers from the CGU-2 series are equipped with an electronic flue gas monitor.
If flue gas is escaping at the draught hood this shuts down the gas boiler. The boiler
restarts automatically after approx. 15 mins.
Caution - risk of damage, poisoning and suffocation.
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