10.2.11 Checking the PS air pressure differential switch
Checking the air pressure differential switch + side
1. Switch off the boiler.
2. Disconnect the silicon hose on the + side (P1) of the air pressure
differential switch.
3. Take a large plastic syringe and connect a T piece with a hose
connected to the mouth.
4. Connect the + side of the air pressure differential switch to one end of
the T piece with a hose.
5. On the other end of the T piece, connect the + side of a pressure
gauge.
6. Turn on the boiler
7. Push the syringe in very slowly until the boiler goes into failure mode.
Code / .
8. Make a note of the pressure indicated by the pressure gauge at that
point.
A switch pressure of between 5.5 and 6.5 mbar is fine. A lower or
higher switch pressure indicates a problem with the air pressure
differential switch.
Fig.69
+ side of the air pressure differential
switch
10 Maintenance
7600532 - v.11 - 13122018 61
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