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hmm interesting... so when on heating you think the flow switch switching between dhw and heating and causing a prob?? ill try taking the flow switch off the diverter valve see if it makes a diff,... and manually press and again see what happens. would never have thought of that ill give it a...

hi guys thanks for the feedback. no its not going to lockout,.. it just keeps trying the process. The fact it does it on both DHW and CH leads me to think its not the thermistors myself... costly fix then :(

hi guys... nice site. wandered if anyone could help me... i have a ravenheat ls80... and when ever i go to fire up the hot water or heating... it will click in .. then off.. then on .. then off... and you just continuously hear the relay clicking on and off rapidly... my first thought was...