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thanks dave the reset button was the problem, probably because i had to partially drain down the system the other day

thanks for the advice i will try to check it out

hi i've got an ecomax pro 18e vaillant boiler and the machine will not fire up.its been working perfectly up to now but all it does now is try to fire up then displays fault code 5. the manual states this is an overheat fault.is this a fault that is out of my hands or is there anything i can...