Is my diverter valve faulty?

Fordy81 · 28 Jun 2014

I'm having problems with my boiler continuously switching on and off every few minutes when putting the hot water or heating on.

While 'investigating this, I'm not sure if my diverter valve is working properly. I have a Honeywell one that looks very much like this;

http://www.uheat.co.uk/warm-water-u...__2PV28.aspx?gclid=CJrGm5rpnL8CFSf3wgoduj4ATQ

With the hot water on, the lever is at the bottom. When lifting it, it offers resistance and as soon as I let go it slowly goes back down.

With the heating on, the lever is at the bottom but it's completely loose.

I didn't test it with both heating and hot water on.

Does this sound normal? Rads do get hot, as does the water but a lot slower. Just wanted to check this is normal.

Thanks

Armo74 · 28 Jun 2014

The one in the picture is a 2 port I assume yours is a 3 port?
Could be a dodgy microswitch in the actuator.
Normal to have resistance on the lever in hot water only mode as the valve is in its rest position.
The lever is there for system draining/filling purpose.

mcmoby69 · 28 Jun 2014

check if your pump is running.

Fordy81 · 28 Jun 2014

Armo74 said:
The one in the picture is a 2 port I assume yours is a 3 port?
Could be a dodgy microswitch in the actuator.
Normal to have resistance on the lever in hot water only mode as the valve is in its rest position.
The lever is there for system draining/filling purpose.

How would I tell?

So the lever will always be in the same position regardless of whether I want water, heating or both?

Sorry, can you explain how it works for draining/filling?

Thanks

Fordy81 · 28 Jun 2014

mcmoby69 said:
check if your pump is running.

It is running, I'm just not sure how effectively.

I undid the screw at the front and when putting a screwdriver in I could feel it turning.

I am wondering whether the pump not functioning properly is causing my boiler to keep turning on and off.

Armo74 · 28 Jun 2014

3 port= inlet from boiler and 2 outlets hot water and heating.
2 port= inlet from boiler 1 outlet.
You could either have,
1,2 port.
2, 2 ports.
3, 2 ports if you have zoned heating.
1, 3 port.
The fact that you referred to it as a diverter valve suggests a 3 port also known as a y plan system.
When you push the lever it can be latched in the open position on a 2 port and in the mid-position on a 3 port to enable the system to be completely drained and re-filled.

mcmoby69 · 28 Jun 2014

this is a three port

http://www.screwfix.com/p/honeywell-v4073a-3-port-motorised-valve/31421

could do with knowing what boiler and heating system you have

Fordy81 · 28 Jun 2014

Yeah definitely a 3 port then.

Potterton Suprima 50. Wilo 50 Gold Pump. Open vented (F&E in the loft). Hot water tank in airing cupboard. Boiler in kitchen. Is there anything else I've missed?

mcmoby69 · 28 Jun 2014

check your system is full of water by bleeding air from upstairs rads, bleed the cylinder circs too if you can.

does the pump appear to be running fast enough? can you stop it easily with your finger? have you tried turning the pump speed up?

check around the cylinder pipe work for sludge using a magnet, if it sticks to copper pipe then there is sludge inside.

probably be worth getting a pro in.

Agile · 28 Jun 2014

That boiler does not modulate so immediately it reaches the set temperature it turn off!

One think you could check is the flow and return temp at the boiler WHILE it is firing!

Tony

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Is my diverter valve faulty?

Similar threads