I have a vokera maxin which keeps locking out.
this is regardless of whether the heating is on or you are just running hot water, there is no time limit on how long it takes. you could be half way thru a shower or it can happen when you initially turn the tap on.
a few weeks ago the water came out red hot and sometimes the heating does not get as hot as normal.
Hi
Sounds like the primary thermistor is faulty, this clever little device tels the pcb how hot the primary water is, and so controlling it's temperature, when they go faulty the primary circuit can overheat and go to lockout.
mike
February 2008
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.