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Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
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I have a vaillant thermo compact boiler and have a f33 fault,

Customer Question

I have a vaillant thermo compact boiler and have a f33 fault, and no heating
Submitted: 3 years ago.
Category: Appliance
Expert:  Plumberpro replied 3 years ago.
Plumberpro : Hello . Are you sure it is a thermo compact ?
Plumberpro : Have you got the exact model number.
Plumberpro : Hi . F33 would indicate a problem with either the fan or the air pressure switch. Has it been happening regualry?
Customer: Hi
Customer: hi I don't have model number. Not used heating for a while and switched on yesterday and problem occured
Plumberpro :

Is it a combined boiler?

Plumberpro :

sorry ,meant combined boiler

Plumberpro :

Combi ,sorry can't turn off auto spell

Customer: Yes
Customer: Boiler comes on for 1 or 2 mins then seems to cut out
Plumberpro :

Ok. If you run the hot tap ,does it do the same ?

Customer: Will try it
Customer: Yes
Plumberpro :

Hi . you have a problem with either your air pressure switch or fan . when the fan runs the fan pressure, closes the air pressure switch to open the gas valve and fire boiler . this is a safety to ensure the boiler will not run if the fan is faulty . these can be tested with a multi Meter ,but I would replace the fan and air pressure switch .

Customer: Thanks any idea on cost?
Plumberpro :

Fan can be pricey unless you live near hanger lane in London and don't mind reconditioned. Around 140. Air pressure switch about 30.might be worth changing this first.

Customer: Thanks appreciate it. Live in Wales!!
Plumberpro :

Oh , love Wales. All the best , would you mind rating me ,thanks

Plumberpro :

Try googling reconditioned boiler parts in Wales.not everyone will use them but it a lot cheaper and I never had a problem with them . by the way you can rate me but still stay with me for any other help you need

Plumberpro :

Hello . please don't forget to rate me as ok or better .thank you .just answer will only pay me if I have been rated , cheers