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- 16 Aug 2015
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I have a Main 30HE that's having an issue on the DHW. When I run the hot water, the boiler runs absolutely fine, but the primary water is largely getting diverted out to the CH circuit. I know it's a fairly common with these boilers that this will happen if the plate heat exchanger is blocked, but I've had that off and it looks fine and the CH water was totally clear. Is it possible that it is still blocked/furred up despite looking ok? Is there any other common spot to get blocked up and cause this issue, or is there any other obvious fault that might be occurring?