ravenheat :) dry cycling

[joe plumber]

hi all got a raven heat csi120 low nox in my own house (dont start) been in a few years and has worked as well as can be expected. however recently the boiler seem to dry cycle it come on full pelt then clicks off after a minute or so repeatedly it started in CH and is now doing it in DHW as well i think it may be the thermistors?? though i haven't had the time to give it my full attention yet and there tech line is a bit like banging your head against a brick wall. I wondered if any of you guys had any experiance working on them?? i've yet to have the pleasure

 

[oldplumber]

the only one Ive seen recently was leaking at every joint, it was only 4 years old and acted more like a sieve than a boiler. However start with the resistance on your thermistors to begin with like you said. (then throw it away)

 

[Billy Bob Bob]

have to agree with old plumb throw it aw.........thats right resistances as a guide only 11k cold,the clip on one plays up try some heat sink compound first,if that fails recycle it

 

[FD Powerflow]

You didnt get this from me but the top technical guy at Ravenheat, John Wilson's mobile is <number removed> he's honestly a bit of a genius. If you know what your doing he'll probably guide you through diagnosis/fix.