Potterton Promax HE 15 stays on constantly

[Kitch999]

Hi - I'm new! Hello to all.

I have a problem with the above boiler in that it just stays on constantly. Regardless of what temperature I put on the thermostat and regardless or whether or not its part of the scheduled daily timings, its just on. On full tilt too, the radiators are too hot to touch.

I've tried to reset it, which doesn't work. I've switched it off at the wall for a good few hours and it still powers up to full and keeps going when I switch it back. Even the temperature control on the boiler itself doesn't do anything.

I wanted to get the thoughts of people on here before I ring a qualified person to look at it. I'm not planning on doing anything DIY (not qualified), but I'm just concerned about getting ripped off.

I can't really think what else to try and a google search doesn't really help (its difficult to define the search term to get the right results). I had seen a website about it not modulating correctly and talk of PCBs etc, but that's way over my head.

Any help/thoughts would be appreciated.

Thanks

James

 

[Dotty]

Doubt very much it's the boiler if you have a zoned system.

And don't fret about getting 'ripped off'. It may surprise you that the vast majority of us are reputable business men regardless of what Dom might have you believe.

The bad apples are far and few between.

 

[Unregistered]

Oh I'm sure the majority are honest and great at their job. I just seem to be unlucky with that sort of thing (I always get the 0.1%).

Not sure what you mean by zoned system. Would you mind expanding please?

 

[village idiot]

Oh I'm sure the majority are honest and great at their job. I just seem to be unlucky with that sort of thing (I always get the 0.1%).

Not sure what you mean by zoned system. Would you mind expanding please?

You need to try and ensure you stay registered

AS cropie says, it's nothing to do with the boiler. So try and relax. If it was, the display panel would have asked that ''contact installer''

 

[Dotty]

Please log back in.

Can you separately control the heating up and downstairs?

 

[Dotty]

Not too familiar with baby sized boilers. Is the HE15 a combi?

 

[village idiot]

Not too familiar with baby sized boilers. Is the HE15 a combi?

I don't think so. Heat Only

 

[Dotty]

Zone valve.

 

[Billy Bob Bob]

Not too familiar with baby sized boilers. Is the HE15 a combi?

15kw combi LOL

 

[Unregistered]

Sorry, replied on my phone.

It isn't a zoned system then. Just controls the whole house. I think it is a combi as it does the water as well (I have the boiler upstairs and a massive water tank thingy downstairs).

@Village idiot - there isn't a readout as such.

It looks like this one. There are 3 lights around the digital read out. One to show its on and heating stuff (green), one for the pilot light (amber) and I assume the top right light is for when there is an error code (I assume red).

There are a few instructions on the panel and it describes a few specific error codes where a reset will do the trick. Any other code suggests contacting an engineer. I'm not receiving any error code with this issue.

 

[Kitch999]

Grr - sorry. Logged in now.

 

[village idiot]

15kw combi LOL

I think that came about because I mentioned: display panel would have asked that ''contact installer'' So that confused cropie. My fault, not his.

 

[village idiot]

Sorry, replied on my phone.

It isn't a zoned system then. Just controls the whole house. I think it is a combi as it does the water as well (I have the boiler upstairs and a massive water tank thingy downstairs).

@Village idiot - there isn't a readout as such.

It looks like this one.

Can you not post a picture of your one?

 

[Billy Bob Bob]

Grr - sorry. Logged in now.

you have a promax system boiler if the controls are laid out like the one above,if not and it looks like this its a promax heat only

 

[Dotty]

15kw combi LOL

As I said. Baby boilers.

 

[Kitch999]

Sorry - this is my boiler:

 

[Billy Bob Bob]

Sorry - this is my boiler:

View attachment 23811

definitely a promax system,based on the baxi duotec range,quite a good boiler

 

[stevetheplumber]

problem will be on the system controls not on boiler

 

[Kitch999]

Not at the moment it isn't!

 

[Billy Bob Bob]

this does not sound like a boiler problem,its a control issue,probably a faulty motorised valve calling for heat all the time

 

[Kitch999]

problem will be on the system controls not on boiler

Ok - do you mean where I switch it on or off and set the timings etc? Do you need a picture of that too?

 

[village idiot]

something like this
V4073A Motorised Midposition Diverter Valve - Honeywell UK Heating Controls

 

[Kitch999]

Hi again - having switched the boiler off overnight, I switched it on again this morning (right in the middle of a scheduled program). It fired up fine, stayed at the correct temperature and switched off at the correct time.

Then it came on again this afternoon at the correct time and stayed at the right temp again.

After the message last night from village idiot, I found the diverter valve and gave it a little wiggle as I tried to see the manufacturer. No idea if that has made the difference. Presumably its not fixed and its knackered in some way.

Any thoughts from anyone?

Cheers.

 

[Tjdservices]

Post a pic of the motorised valve, someone will be able to id it