Central heating pump running constantly and boiler misfiring

[DIYNOVICE13]

Interestingly too even if I turn off the pump now. The boiler will still whir as if its going to fire up.

 

[Stuckinarut]

Interestingly too even if I turn off the pump now. The boiler will still whir as if its going to fire up.

Well, as others have said, probably a job for a decent heating engineer (sounds like you’re struggling to find one though). If you could find the voltage then that’s half the battle.

 

[fixitflav]

If boiler AND pump running on the it's a MCV issue as microswitch is remaining depressed.

As I said in #5

 

[fixitflav]

Apologies yes. It would be an s plan then

No problem. See #5

 

[fixitflav]

No need for apologies

Hey, it was me he was apologising to!

 

[DIYNOVICE13]

No problem. See #5

I have had someone look at the MCVs and one was replaced as was stuck.
The others appear to be operating, I can them open when I call for demand on the correlating area.

 

[fixitflav]

I have had someone look at the MCVs and one was replaced as was stuck.

The valve stuck, or the microswitch?

The others appear to be operating, I can them open when I call for demand on the correlating area.

The microswitch closes when the valve opens, but can stick closed.

 

[dilalio]

As I said in #5

Didn't notice.
Was replying to OP.
tend to get straight to the issue when I'm freely contributing to this forum... Spend more time here than I probably should, as it is.

 

[Stuckinarut]

Hey, it was me he was apologising to!

Yes I know, but it was stated in the very first post that’s there’s dual zones, so maybe you owe the apology?

 

[fixitflav]

Yes I know, but it was stated in the very first post that’s there’s dual zones, so maybe you owe the apology?

But he didn't say what valves and control system he has. That's why I was asking. Who should I be apologising to?

 

[Stuckinarut]

But he didn't say what valves and control system he has

It runs on a 2 zone system for heating, thermostat in living room for downstairs and hallway for upstairs. With a seperate water programmer under the boiler.

That's why I was asking. Who should I be apologising to?

The OP, since he apologised to you even though he hadn't done anything wrong

 

[fixitflav]

"It runs on a 2 zone system for heating, thermostat in living room for downstairs and hallway for upstairs. With a seperate water programmer under the boiler."
But not the valve arrangement, which could be the explanation of the continous running.

The OP, since he apologised to you even though he hadn't done anything wrong

I don't see the logic of that. I hadn't accused him of anything, or wanted, or expected an apology. In any case, my #24 was only a bit of fun, hence the

 

[Agile]

Normally the pump would be connected to the boiler in order to provide pump over run.

If boiler is in cold area they sometimes run pump if boiler is at less that 5 C as a frost protection precaution!

 

[dilalio]

Normally the pump would be connected to the boiler in order to provide pump over run.

If boiler is in cold area they sometimes run pump if boiler is at less that 5 C as a frost protection precaution!

Boiler also firing Tony.

 

[DP]

Boiler also firing Tony.

Also pump was running during summer. OP selected null speed setting to disable the pump. Boiler would still be firing but heat from it going nowhere as pump not spinning now.