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29. Checking the DHW heating
- Shut off the cold water and depressurise the system.
If the DHW output of a FGB-K is too low, take the following action:
- On FGB-K units, check and clean the dirt filter.
- Remove the plate heat exchanger of the FGB-K.
- With a 4 mm Allen key, release screws (2 pce) and pull off the plate heat
exchanger (PHE) upwards.
- Descale or replace the plate heat exchanger.
- Replace and grease the gaskets of the plate heat exchanger.
- After fitting, tighten the screws to a torque of 3.5 ± 0.5 Nm.
- Open the gas ball valve and switch on the appliance.
- Check the gas train and hydraulics for tightness.
- Hook the casing back into place and secure it.
- Press the emissions test mode key.
Checking the DHW heating
Plate heat exchanger PHE
Screw
PHE
Screw
PHE
Dirt filter
Test run
Test the combustion parameters following all maintenance work.
For instructions, see chapter 25.
Testing the combustion
parameters
Activate emissions test mode (press
and hold both keys simultaneously
for 5 seconds).
