Pump Stays On!

[bcfcjwb1]

Hi,

I hope someone can help me. The pump on my central heating system is on staying on, even when the heating or hot water is off!

I've had a look at the 2 (2 port) motorised valves in the system and they seem to be working ok.

I have an 8 year old Megaflow pressurised system - installed when the house was built.

Any help gratefully received.

Thanks

 

[Softus]

Sounds like faulty overrun - which boiler do you have?

 

[bcfcjwb1]

It's an Ideal Classic - the only reference that I can find on it is FF260.

Hope it makes sense to you!

I should have mentioned before that I had an intermittent problem with one of the motorised valves about 4 years ago. A piece of plastic on the actuator had broken off and caused the pump to stay on. I could sort this out temporarily by 'wiggling' the actuator to trigger the microswitch! I managed to fix this permanently and have had no problems since. The difference this time is that the microswitch seems to being triggered ok!

 

[gas4you]

If you're comfortable with live electrics you need to turn off the power to the heating system, take the cover off the wiring center and remove the 2 orange wires from the zone valve.

Turn power back on with programmer off for ch and hw. Whichever orange wire is live is the valve head that is faulty. The microswitch will have stuck on.

If it is the hw then get it replaced asap as the second function of this valve is as a failsafe for the megaflo should the boiler not switch off.

 

[bcfcjwb1]

Hi Dave,

I am comfortable with live electrics, but not sure what you mean by the wiring centre - where do I find this? Is it next to the cylinder or in the boiler?

Assuming that it is the microswitch, can I replace just that or will I need a new motorised valve?

Thanks

 

[gas4you]

The wiring centre is usually in the airing cupboard where all the wires go into, it may be surface mounted or may behind a blanking plate.

 

[bcfcjwb1]

Thanks Dave, just been upstairs and found the wiring centre.

Found the 2 orange wires too!!

As per my previous post, assuming that it is the microswitch, can I replace just that or will I need a new motorised valve?

 

[gas4you]

You need to replace the valve head. Not the body as well.

 

[bcfcjwb1]

Dave, thanks for this...having looked around, I can only seem to buy the whole thing.

Can you advise/recommend where I can buy just the head from.

Really grateful for your help.

 

[gas4you]

What make is your zone valve?

 

[bcfcjwb1]

One is a Sunvic and the other is a ACL Drayton Lifestyle.

Thanks

 

[ollski]

One is a Sunvic and the other is a ACL Drayton Lifestyle.

Thanks

Sunvic you can change the head but the chances are the lifestyle will need complete replacement as it was only the most recent models that are removable and they have a little black push button opposite th A B indicator.

 

[gas4you]

Which one is constantly live on the orange wire?

 

[bcfcjwb1]

The wiring was very complicated, so I've decided to do it tomorrow when the mind is fresher!

 

[gas4you]

Seperate the 2 orange wires to test