Baxi 105e Combi & Mira 415 Shower problem

[steve_smh]

The problem I have is that the burners cut out for several seconds or so when showering. When this happens the DHW light stays on though. I seem to have warm water for 40 seconds followed by 10 seconds of cold. I cannot replicate this fault when using hot taps. I have recently replaced the diaphragm in the boiler (different fault). I have also changed the cartridge in the shower. The only other point I have is that this fault first appeared last winter, but seemed to go away in summer only to re-appear again this winter.

Any help?

 

[pannierstan]

Yes the Mira 415 is not thermostatic so when the boiler is reaching high internal temperature (which it will do as showers do not use as much water as a tap) then the boiler is reaching max temperature and shutting off for a few seconds then refiring.

The result is you get a cold slug in the shower. Believe me I have the same shower and a Vaillant Ecomax 828/2e.

Unless you have problems with the calorifier transfering heat to the DHW then I would suggest turning down the Hot water temperature on the front of the boiler to perhaps half and give it a try.

You will have to turn up the shower temperature but this certainly worked for me.
If you then want to run a bath then turn it up again.

Stan

 

[baxpoti]

You could also try a new DHW thermistor (especially if its got a black plastic head)

 

[ChrisR]

Try turning a hot tap on just a bit. Same behaviour?

Other causes can be sludge in the tap water heat exchanger, or a gas valve which needs adjusting. Perhaps its going out instead of low.

 

[Slugbabydotcom]

The result is you get a cold slug in the shower.

I get that when me leccy key runs out