Help an Aussie with heating - Vaillant Ecoplus 418

[AussieStu]

I've got a newish (< 6 months) Vaillant Ecoplus 418 open vent boiler which didn't come on this evening. There were no error codes. It only started working when we cranked up the old thermostat to maximum 35C.
We had the thermostat set at around 22C, so my question is do we need to replace the old Potterton thermostat which is many years older than the new boiler? Any suggestions on where to get this and do I need a registered heating engineer to install it?
Please help an Aussie who is way out of his depth with anything heating related!!

 

[Hugh Jaleak]

Welcome to a very cold England.

My advice would be to get a heating engineer or decent electrician to test the thermostat. Soon be able to tell if its switching correctly by testing it. New 'stats widely available, www.screwfix.com is one supplier with a good range, B&Q, Wickes etc will also stock them.

 

[AussieStu]

Thanks Hugh, i ducked next to ask the neighbours if they knew a decent tradie in the area and they've put me onto a decent chap.
Cheers!

 

[Hugh Jaleak]

Nice one.

 

[Agile]

Its only a small job but still I have to get there. What I do when I am there is less important.

I usually charge our usual diagnostic fee and service the boiler and fit the thermostat which ideally the custoimer has chosen with my agreement so that they cannot object to the appearance if I were to choose it!

Remember you are only guessing the stat is at fault. It probably is but easy to test contact resistance though.

Tony