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thanks Agile will replace pcb will post back results

valliant vcw-sine 18 t3 w approx 20 years old

when switching on my combi it runs fine for a while then overheats so i have to reset it normaly cuts in and out around 60 so i watched boiler till it done it again when temp hit 85 i switched boiler of then back on ran fine no burner on until it hit 55 checked ntc sensor ok thermostat onboard...