Hi, I've got a baxi 105e which is causing me some issues. It started with the DHW going cold and then hot again then cold again. I cleaned out the DHW HE to no avail so bought a new one and fitted that to no avail. The hot/cold thing only happened intermittently. Recently the 60 degree light is flashing and no hot water at all, the rest switch did nothing but I found that by turning off/on the electrics made it work again. I thought the system might be sludged up so bought some Fernox cleaner and left it in the system for a week. When I drained and flushed the system some dark matter emerged but not a lot. Whilst the system was drained I took out the Primary HE and cleaned it, again very little debris came out (I serviced the boiler at the same time). I also removed the pump head (the flashing 60 degree light suggests that either the water pressure is low or the pump is not working) again no issues it rotates ok and no debris.
On putting it all back together everything was working for a while then it went back to the flashing light. powering off and on again brought the system back to life. I have no problem with the CH this works all the time.
I have changed the DHW thermostat, no difference. I have also changed the diverter valve diaphragm and pin. Although the valve seems to be working ok even when the DHW does not turn on the flame.
Other things I've noticed both the DHW and CH seem to be rather hot and turning down the dials seems to have little affect.
So I'm a little perplexed as to what to try next.
Any assistance gratefully accepted as ever.
On putting it all back together everything was working for a while then it went back to the flashing light. powering off and on again brought the system back to life. I have no problem with the CH this works all the time.
I have changed the DHW thermostat, no difference. I have also changed the diverter valve diaphragm and pin. Although the valve seems to be working ok even when the DHW does not turn on the flame.
Other things I've noticed both the DHW and CH seem to be rather hot and turning down the dials seems to have little affect.
So I'm a little perplexed as to what to try next.
Any assistance gratefully accepted as ever.