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Thanks for the replies guys. I should add the following:- The fan changes to high speed when you either request DHW or CH. It returns to low speed with no demand. As I said, the old DPS had stuck in 'high-speed' mode (i.e., 3 and 2 connected). The replacement works fine. I have a complete...

Hi Guys, I have a somewhat long-in-the-tooth one of the above. Had a problem with the fan DPS which I have replaced. The problem was that switch was stuck saying that the fan was at high-speed. I noticed it because there wasn't the usual slight pause before the main burner lit. The...