ecomax 828 - No hot water please help

[james_bristol]

Afternoon all

I seem to have a hot water problem with my Valiant ecomax 828 which i think may be caused by the aqua sensor but am not sure.

The central heating is working as normal and the hot water is heated if I turn the boiler to constant hot water mode (however this seems to only heat a small amount - presumably stored inside the boiler). The problem seems to be when i turn on the tap as the boiler does not fire up and heat additional water.

I have tried the diagnostic mode and d.22 (hot water demand) is always 0 with or without the tap open.

There is a 5V supply to the aqua sensor and the signal back is also 5V - should this vary when the hot tap is open.

Is it possible that the sensor is jammed? Can it be easily fixed? (i.e. by a competent home DIYer). Looking at the sensor there is circlip holding in the sensor which is very tempting to remove and have a look at before calling anyone out.

You help and advice is most appreciatted

James

 

[Agile]

The flow sensor gives back an ac voltage.

The turbine often jams and is easy to clean. You rarely find what has jammed it and perhaps that bit of rubbish has just gone back down the supply pipe.

Tony

 

[james_bristol]

thanks tony

by "easy to clean" can i clean it with the main casing in situ i.e. stop the cold supply, drain the hot water and remove the circlip and clean the sensor or would does the complete assembly need removing from the boiler?

 

[james_bristol]

Just for info.

Problem is fixed and it took about two minutes and was very easy.

Isolated the power supply and cold water.
Removed the circlip and pulled out the sensor (it is actually a small turbine).
Couldn't see any debris as probably washed out with the water that came out.
A quick clean up and put it back in.

d.22 now shows 1 when the hot tap is open and the boiler fires up as required.

I make that a £100 saving.

Thanks

 

[Agile]

The flow sensor gives back an ac voltage.

The turbine often jams and is easy to clean. You rarely find what has jammed it and perhaps that bit of rubbish has just gone back down the supply pipe.

Tony