Worcester Bosch Greenstar HE problems

[molibdimum]

Hi guys

I've had a Worcester Bosch Greenstar R29 HE condensing boiler for just over 7 years.

The temperature display regularly reads over 90 and I was wondering what causes this and if it should be something to worry about.

Also every so often there is a small leak coming from the front panel.

We had a plumber round to check it over and he replaced the flue duct assembly because the internal seals were shot but its leaked again since.

I'm no expert so apologise if my terminology is not quite correct but I would appreciate some opinions before I call the plumber again.

 

[molibdimum]

Bump

 

[adlplumbing]

check your radiators see if their getting hot in middle at the bottom

 

[molibdimum]

Sometimes some of the radiators are warm without the heating set to on.

 

[HootingOwl]

could it be a failed hot water flow switch - so the boiler thinks that there is a constant demand for hot water even when the hot taps are closed?

 

[adlplumbing]

yes but question was about the 90 degrees
so do bottom of the rads get warm in the middle

 

[HootingOwl]

if the hot water flow switch is stuck in the on position, the boiler will indeed get up to 90 degrees as the thing keeps firing and is then unable to dissipate the heat.

rads getting warm with the heating off sounds like leakage through the diverter valve. if the flow switch is stuck in the on position then this would explain why the rads are getting warm with the heating set to off.

advice to OP is to get someone in to check the hot water flow switch if they are not confident enough to do it themselves.

It could be a busted thermistor - and with the hot water in 'comfort' mode then it may explain why the rads are getting hot and the temp is so high. I have had to replace thermistors on these before.

 

[boilerdoktor]

don t think it has a flowswitch !!

 

[molibdimum]

yes but question was about the 90 degrees
so do bottom of the rads get warm in the middle

Ill check the rads at the bottom middle and report back.

Also I'm not sure if my boiler has a flow switch.