Underfloor heating pump turns on central heating pump

[dipzv]

Hi,

My wiring needs some changing but I don't know what to do. I installed new central heating and underfloor heating system; when one of the system turns on (UFH or CH), it turns the other system pump on as well(even though its off on the time clock); the trigger cable is all linked as the boiler only has 1 trigger so the power in the trigger is turning everything on directly even though the time clock is off. My master unit for UFH doesn't support central heating; the newer John Guest units support central heating which stops this trigger fault to turn on all systems however this is costly at £100. Are there any other solutions to stop the trigger turning on all systems?

Thanks!

 

[Terrywookfit]

Use a relay.

 

[dipzv]

Where can I get the relay from, any link? I tried to look for one before but I couldn't find any.

 

[Agile]

Maplins sell some relays!

 

[SimonH2]

See //www.diynot.com/forums/electrics/help-with-2-zone-valves-doing-2-pumps-and-one-boiler.334974/