central heating

[RAYMAN]

have problem with heating system radiators heat up when off hot water operating on rayman

[crumpeter]

it sounds as though the radiators are working on gravity.there should be a non return valve somewhere in the heating system to stop the water circulating when the hot water is turned on.

[RAYMAN]

thanks crumpeter but this system has worked for years without fault it has two 2port zone vaulves ch and hw could it be one of those

[RAYMAN]

Re:my two 2port zone valves I notice that they both open when the HW switches on is this normal or does this mean my electronic timer is at fault

[RAYMAN]

problem solved.faulty programmer,poor solder joints on pcb creating resistance on circuit,repaired, plus non working CH valve,replaced.thanks crumpeter for yourcomment.

[crumpeter]

Rayman, sorry I didn't get back to you, its been months since I have used this site, glad you got it sorted out.