Thanks for prompt reply. Can you help clarify for a PowerMax novice why a failed clock only affects CH but not hot water. Is there any chance that there is a problem with the CH pump as well - a common theme on this forum. Would be my worst case scenario if the clock/programmer (P458) is...
Proud owner of a PowerMax 155 which has been trouble free since installation in 2002. Now only have hot water, no central heating. Has power supplied (orange light on) gas supplied, but cannot get burner to light and stay on. Tried the re-set but now there is no display at all on the...