The water heater is now under water supply pressure. There should now be no water
coming out of the inlet combination expansion valve or (if used) out of the T&P valve
(3). If there is, the cause might be:
The water supply pressure is greater than the specified value (see section
12.1).
Rectify this by fitting a pressure reducing valve (1).
The expansion valve in the protected cold supply set-up is defective or
incorrectly fitted.
7.8.2 Procedure for checking the supply pressure
To check the supply pressure, proceed as follows:
Isolate the appliance from the power supply (see section 4.2.2).
Carefully remove the covers from the appliance.
The electrical section is now visible.
BFC 28 to 60
There is a test nipple before the gas control valve (for natural gas appliances) or
before the pressure-reducing valve (for LPG appliances) so that the supply pressure
can be measured.
This test nipple has a sealing screw. Loosen the sealing screw by a few turns. Do not
completely loosen it as it can be difficult to retighten.
7.
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1.
2.
3.
4.
68 Installation, Maintenance and Service part
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