I was amazed to find Rober originally described the problem rather wel
(over 1 year ago!), I basically have the same problem with my boiler.
Although, when i turn the boiler on for the first time and try the ho
water in either mode (HT, or, CH+HW), it takes about 2 minutes for th
boiler to fire up (as if it is working 'normally') and within less tha
a minute, it cuts off...never to fire up for hot water again.
In any case, I followed up the original post, replaced the DH
Thermistor (new part code: S5704200 and still costs about £20)
however, there was no change. The problem persists...
Any further suggestions would be greatly appreciated.
Thanks in advance