Vokera linea 7 DHW problem

[RoryD]

Bit baffled. fires up gets to temperature on DHW then cuts without modulating at all. I've removed and inspected the Secondary heat exchanger, water passes thru both sides ok.
Can't find a resistance reading for the sensors dhw was at 9.7Kohms.
At one stage I did get a 07 error (primary sensor)but that eventually went and never reoccurred
Gas valve is a bit noisy but all ok on heating.
PCB or sensors??I thought afterwards about any filters, are there any??? however the overiding influence would have to be that there was no modulation. incidentally I checked the low rate and that was fine.

 

[Ermintrude]

Sounds like O/H stat playing up? Resistance correlates to temp. So need temp to check. Call technical or check the recent thread on here regarding NTC

 

[GrahamM]

As above. Initially points to thermistors which is a very common prob with these. For the sake of a few quid change the thermistor first to at least rule it out before spending any big money on a whim.