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hi we have an issue with our heating and water system . new flow switch and new pump , system bled , all done by a professional but still no hot water or heating. when the plumber left yesterday we had boiling radiators and some hot water although the heating was switched off. my suspicion is diverter valve but unsure as to why nothing is working again now. boiler tries to kick in but says FD error (flow)

would be really happy for some advice as we have been 4 weeks without hot water no and the Mrs isn't happy.

thanks in advance
John
 
B

Burger

Hi John,

I suggest getting your professional plumber back if he/she has supposedly fixed it?

What boiler is it?
 
i tried that lol but they arent answering now or even rang me back. daft as they are local and installed the boiler 4 years ago. looks like weve had a pump for no reason too grrrr
 
its a logic plus 18 i think from memory as im at work. with hot water cylinder and tank in loft 3 way honeywell motorised valve
 
A

Aire

Is it an ideal boiler? Which one? It's or a only 4 years old I'd expect it to still be under warranty. If not then perhaps give the manufacturer a call and ask about a fixed price repair.
 
it is an ideal so it must be 5 years as its just out of warranty, i dont think its the boiler as it was working again yesterday but couldnt switch heating side off without turning radiators off.
 
B

Burger

it is an ideal so it must be 5 years as its just out of warranty, i dont think its the boiler as it was working again yesterday but couldnt switch heating side off without turning radiators off.
Sounds like it could be your 3 port valve or even the programmer. Start with everything cold, put a call/demand for hot water and feel your pipe leading to the cylinder on 3 port (should be Port B). Now it probably won’t get hot as you said you don’t have hot water, then feel Port A side (heating) if this is hot then it’s more than likely 3 port being the issue.
 
A

Aire

it is an ideal so it must be 5 years as its just out of warranty, i dont think its the boiler as it was working again yesterday but couldnt switch heating side off without turning radiators off.
Yeah I was typing my reply before you mentioned it was a heat only boiler. Why couldn't you switch the heating off? If the system was running when there was no demand, the first place I'd be looking is at the 3 port valve, unless there's a wiring fault, this is the only valve that can overide the controls and fire the boiler up
 
B

Burger

Also if you diagnose this to be the fault, either employ a different plumber or maybe even stat wher you are located and perhaps one of the fine chaps on here could help?
 
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Yeah I was typing my reply before you mentioned it was a heat only boiler. Why couldn't you switch the heating off? If the system was running when there was no demand, the first place I'd be looking is at the 3 port valve, unless there's a wiring fault, this is the only valve that can overide the controls and fire the boiler up
all the controls were off for heating but it was still heating all the radiators. im going to have a quick look this afternoon see if i can see anything obvious especially on the 3 way valve. electrics out of my remit on controls really but these havent been touched other than the new pump being wired.
 
Ok here's where I'm at. Took the front off diverter valve and I can move the shaft left and right. Left motor off to see what happens with flow when I turn the valve. Nothing to the left and nothing to the right but in the middle heating and hot water.
 
Another follow up, water is flowing without the diverter head on and me set the pin to the middle, turned all the rads off to stop the flow around them. It will do temporarily until someone can come round or I'm sure it's diverter valve, thinking I need a complete valve assembly as I'm thinking it's breaking down a bit inside. But I'm not too confident draining the system.
 
B

Burger

Another follow up, water is flowing without the diverter head on and me set the pin to the middle, turned all the rads off to stop the flow around them. It will do temporarily until someone can come round or I'm sure it's diverter valve, thinking I need a complete valve assembly as I'm thinking it's breaking down a bit inside. But I'm not too confident draining the system.
It could be, but you’d be better someone else take a look. I’m surprised no one on here has been in touch.
 

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