Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Remove the fan assembly
Observation:
Visually inspect the condition of the air pressure switch tubes and pipes, they should be free from any splits / damage, corrosion or any restrictions or blockages.
Also check the small black test point cap is fitted and sealed.
Are the air pressure switch tubes and pipes satisfactory?
Note:
It is not possible to gain full access to the lower APS pipe as it cannot be removed and is located behind the flue hood / fan mounting assembly, however it can be visually inspected from the top of the appliance using a mirror and torch and it is possible to confirm it is not restricted or blocked by pushing a piece of wire through it. It should be noted there is not normally an issue with this pipe as it is situated in the incoming air.
Also check the small black test point cap is fitted and sealed.
Are the air pressure switch tubes and pipes satisfactory?
Note:
It is not possible to gain full access to the lower APS pipe as it cannot be removed and is located behind the flue hood / fan mounting assembly, however it can be visually inspected from the top of the appliance using a mirror and torch and it is possible to confirm it is not restricted or blocked by pushing a piece of wire through it. It should be noted there is not normally an issue with this pipe as it is situated in the incoming air.
Isolate as per TOPs P4
and refit as necessary