Heating only getting to 42deg

[mark paterson]

hi, I have a vaillant turbo max plus 828e boiler and my heating is only loop warm. It gets to 42deg c on the led screen and then cuts off. The hot water works fine. Anyone know what the issue could be? Thanks

 

[D_Hailsham]

What temperature is the room stat set to?

 

[Dan Robinson]

What status code is given when it shuts down?

 

[mark paterson]

There is no code when it stops. Just gets to 42 and then cuts off. The ok light still flashes to. It's like it sees that temp then stops. Could it be a PCB issue. Or is there a setting that could be causing it to stop at this temp as the stat on the boiler is turned right up?

 

[D_Hailsham]

And the room stat setting is ....?

 

[mark paterson]

If got the room stat at its maximum. And I've tried a few other setting on it but no luck

 

[mark paterson]

I have just took the front of the room stat and it is not connected. It is an old stat so looks like it isn't used any more

 

[JohnD]

I wonder if you have got thermostatic radiator valves.

How hot do the in and the out pipes on the radiators feel?

Are you in England, and why are you running the heating in August?

 

[mark paterson]

I do have radiator valves and the pipes feel loop warm in and out. The valves are all fully open. It is an issue with the boiler just not sure what.
I'm thinking the PCB maybe?
I don't want it on now but I want it fixed for the winter.

 

[JohnD]

When was the last annual service?

 

[mark paterson]

18 months ago

 

[Dan Robinson]

Should be serviced every year.

I said status code. You need to press the I button. You then get an "s" code. What does it say when the boiler shuts down.

Why do you think it is the PCB?

What is the radiator dial set to? When it it turned does the display change?

 

[mark paterson]

Ahh I'll have a look. And no the display dose not change when the dile is turned. I'm not sure if the potentiometer on the board is doing anything.

 

[Dan Robinson]

Then depending on S code, I would say that some ham fisted numpty has snapped the spindle on the dial.

Yet another example of fantastic Vaillant build quality.

 

[St0rmer66]

Then depending on S code, I would say that some ham fisted numpty has snapped the spindle on the dial.

Yet another example of fantastic Vaillant build quality.

+1

Bet thats it. Pull the knob off and sometimes you can use a thin electrical screwdriver to turn it.