When there is a demand for either heating or DHW the pump works but the boiler (Potterton Netaheat Profile 40e) doesn't ignite. The system had a new programmer, room thermostat and Y-valve 5 years ago. The boiler is 34 years old. Any ideas? If it's a cheap fix I'll do it but I'm thinking it's probably a new boiler. I could do with another two years out of it though.
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