Combi Boiler Cuts Out

[billsack]

Hi all,

I have a Ravenheat Combi boiler. I recently fitted a Drayton Wireless Digistat Thermosts to it (following help from this site). I got this working fine and it does the job well.

However, since I did this the hot water supply is playing up. The boiler heats the water for a minute or two and then cuts out. After approximately 20-30 secs it fires back up again.

Can anyone tell me what I have done wrong here? I have wired the thermostat into the boilers internal electrics. Is it interfering with the pump or internal stat or something?

If anyone can help I would be really grateful.

 

[kevplumb]

I have a Ravenheat Combi boiler.

says it all

 

[Agile]

It sounds as if the plate heat exchanger ( if your unidentified model has one ) is blocked. But this would be coincidental with you fitting the room stat.

What model is it?

Tony

 

[billsack]

Sorry its a Ravenheat 820

I know they have a bad rep but it was inherited and I am skint!!!!!!

 

[Agile]

I think the 820 has a four pipe heat exchanger but uses a diverter valve to recirculate the CH water round the boiler only.

Its not immediately obvious to me what has happened but I wonder if its overheating and the thermostat has turned the boiler off.

Maybe the low gas rate is not operating and when it should the burner is going off?

I would suggest you visually check the connections inside the boiler to ensure nothing has been disturbed of come off?

Tony

 

[ChrisR]

It is that type. Check wire on the water temp sensor.
Try being nice about it, it might feel less incllined to be stroppy.

 

[Agile]

I thought all the temperature sensors were phial types ???