DHW Problems Baxi 105E

[mark999]

Hi all
i have had a baxi 105e for 3 year changed out 2 dhw diaphragm with no problems then i received a gas that was 3x more then usual I went to check the boiler and found that the hot water was running continual and the taps where off. I then remove the DHW diaphragm clean and greased plungers tested again seem ok for a bit but then started again doing the same thing can anyone help?????

 

[Mbear]

Sounds like the hw microswitch is stuck in the 'on' position, it'll need changing if that is the issue

 

[Puddle]

Check your pipework in the roof,maybe next door has taped into it,to help run thier new dry cleaning bussiness

or maybe the kids have started taking more than one shower a month

could also be h/w micro switch as well as said spose

 

[mark999]

hi
The microswitch has been tested and are working ok

 

[Mbear]

hi
The microswitch has been tested and are working ok

Testing it once doesn't mean it's working ok all the time, microswitches can stick 'intermittently'

Or it could be dearer gas prices or uve been using more gas I suppose also

 

[Toddyplumb]

If it is on all the time and it is HW demand if there is no tap open or leak it should shut down on overheat !
Had this on a cracked pipe buried in concrete ( after someone else had changed diaphragm , HW thermister and control board took the money and would not go back)
Are you gas safe ?

 

[mikegas]

isolate cold under boiler to confirm no leak

 

[mark999]

Hi
I can confirm that i don't have any cracked or leaking pipes.
But the led on the boiler is still on when I shut off the hot tap.
The other day my wife noticed that the radiator in the bathroom was warm
when I checked the boiler the hot tap led was on and no one was use hot water???

 

[Billy Bob Bob]

diverter valve faulty

 

[Toddyplumb]

Is it just the LED thats on or is it the burner as well?

 

[Bungditin]

Are any fault led's lit up,Tend to find this is a thermistor fault.

 

[mark999]

hi

when i put the boiler on DHW only and preheat off.the temp led,s still come on upto 80c then stops.????

 

[Toddyplumb]

So its got pre heat Its not a 105e its a 105e instant , different thing all together
Are you gas safe ?

 

[Bungditin]

if you have all led's lit including 80 and the boiler is not being used then i still thermistor.