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Looking for the part no of the CH flow service valve, its not shown in the short parts list. Any help would be greatfull

Hi all,down loaded install manual from web site you suggested,thanks Slugbabydotcom for that.Took the plunge and ordered new pcb ,and now everything all ok. By the way pcb has been modified and has new part no 5112380 was[248074]

Sorry about the caps lock. You're right it's my first time in the forum and I'm not used to typing on keyboards. I did suspect the pcb, just wondering if any other component may be at fault? the system was fully working until it was drained.

NO CH. DHW OK.BYPASSED EXTERNAL CONTROLS INC TIME CLOCK.PRESSURE 1BAR . NO HEATING & NO VOLTS ON PUMP IN HEAT MODE.RUNS OK ON DHW. NO WARNING LITES ON JUST POWER ON NEON.CHECK BOTH MICRO SWITCHS & SWAP OVER NTC SENSORS.WAS OK TILL SYSTEM DRAINED, CAN ANYONE HELP.