H/L reset light on a warmflow boiler

[chicken5812]

Hi just wondered if anyone can help me. I have a warmflow boiler and it fires up then the pressure rises to 1 then it cuts out and the H/l reset light comes on. Pressed the reset button, left it to cool, turned it off and on but nothing seems to work. Any info will be great thanks.

 

[dontknowitall]

Has your (central heating) pump failed?

 

[Best]

You have to let the boiler cool sufficiently, before you can reset the high limit stat. Your control stat may be faulty.

 

[Roger Welton]

If the high limit wont reset after the boiler has cooled, then it will require replacement in addition to further investigation as to the cause of the overheat.

I take it you aren't pressing the burner reset and have found the hi limit stat (on or under the control panel)

 

[chicken5812]

Hi just wondered if anyone can help me. I have a warmflow boiler and it fires up then the pressure rises to 1 then it cuts out and the H/l reset light comes on. Pressed the reset button, left it to cool, turned it off and on but nothing seems to work. Any info will be great thanks.

Hi thanks for your advice, I've let the system cool and it fired up ok but then hit 1 on the pressure and the light came back on. This time as it was heating up I took it off heating water and put it on to central heating but nothing happened, does this mean the central heating pump has packed up. Also when it was on heating water the water came red hot for a few seconds then went cold. The vent on top of the boiler also hisses sometimes, if this has any significance. I'd be grateful for any information. Thanks.

 

[dontknowitall]

I'm still thinking pump is worth an investigation.

There are two pipes at the pump - one in and one out. Both should be equal temperature and the pump should vibrate when you put your hand on it.

On the pump there is an arrow indented into its design which shows the way the water flows through it. The pipe entering the pump will be hot. If the pump's not working properly the exit pipe will be colder.

 

[chicken5812]

Hi thanks for the advice.Yes pipe is hot going in and cool coming out. How hard is it to replace the pump? can see how to take it off, how do you turn the water off to the boiler and is there anything in particular I would need to know, Thanks.

 

[dontknowitall]

Sharp intake of breath ... scratch chin ... ooo, you wouldn't want to start from here ... who on earth did that? ...


1. Turn off heating (ie the electrical supply to it)
2. Just above and below pump are the gate valves, which need to be turned off.
3. Remove wires from pump.
3. Have towel ready and unscrew pump from gate valves then remove pump.
4. Put new pump on (correct way round) and wire it up.
5. Open gate valves
(6. Phone for plumber when it goes wrong?)

 

[chicken5812]

Thanks, any ideas on places for best priced pumps. Also there are two pumps they look like they are joined together, they look like they will seperate will one go to heating one to water, is it just the water one that will need replacing or both. Thanks.

 

[dontknowitall]

I'd pop into your local merchant for prices.

It's unlikely that both pumps have failed. If one has failed then worth changing it. If both have hot pipe one side and cold the other then it's more likely to be something else.