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I found the reset button and it started up for a bit. I think that it has an air lock somewhere. proving a pain to purge out.

Hello. I have recently drained my heating system and replaced the water pump.I have also checked the 3 port vale.(thought that may have been faulty). When I filled up and switched the heating back up the boiler worked for a bit. but now it seems to have died. no sounds can be heard or reset...