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Thanks Delta, Yes, it does seem to do the same on both HW and CH. Intermittantly though. Sometimes fires striaight up, other times long delay. Yes, I was aware of the 3 mins delay, but the problem can also occur from cold. I like the idea of the Modureg but the relay on the PCB isn't...

I am experiencing a long delay of one to five minuites before the boiler fires up. The fan runs so I know the flow switch works. I have had a multimeter across the air pressure switch which is fine. The LED row indicates all ok. The DHW thermistor reads a correct resistance for the...