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Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3586
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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We have a potterton sentinel x100 inhibitor and it won't

Customer Question

Hi, we have a potterton sentinel x100 inhibitor and it won't seem to switch off. We have it on timed and temperature set at 18 degrees. We thought it was the thermostat but even if you turn the timed to off on the wall the boiler still comes on. The only way to stop it is to switch it off and back on which can't be good for it. Any suggestions? Thanks Mike
Submitted: 10 months ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 10 months ago.

Do you know the boiler model, that sticker is the inhibitor in the water system.

Customer: replied 10 months ago.
Hi, it's just says potterton suprima but no model number. Does this help?
Customer: replied 10 months ago.
Found the manual and the serial code means it is the suprima 40
Expert:  Andrew Smith replied 10 months ago.

Potterton Suprima 40 - ok, a standard boiler then.

If the boiler continues to run on after everything is off then it is usually the motorised valve - can you locate this?

Turn your hot water and heating off at the clock and then tell me if the lever on the valve is stiff or slack?

Customer: replied 10 months ago.
Hi, where would the motorised valve be?
Customer: replied 10 months ago.
Hi, think I found it in the airing cupboard. It had three positions H, M and W is this it?If so it is stiff and set on H. I actually don't think I can move it to a different position.
Expert:  Andrew Smith replied 10 months ago.

ok, it is seized in the heating position.

If you get it swapped out then it will cure your problem.

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