Mira mode mixer shower issue...maybe....

[Moffski72]

Anyone had one o these (mira mode thermo mixer) getting crossflow from cold into the hot? Tia

 

[ShaunCorbs]

If the nrv is stuck open / broken yes very easily esp with higher pressure on the cold

 

[Moffski72]

no check valves on these...spoke to mira and they said they dont need em coz of the way the valve is designed...also its on a combi so equal pressures, give or take...

 

[ShaunCorbs]

theres your problem if there not equal

best to check hot and cold pressures

 

[Moffski72]

Eh? Why would they not be equal pressures if it's a combi feeding the shower...?? They're both at whatever the mains pressure is. The hot might be slightly reduced through the plate I spose, but there's millions of mixers run off combis?

 

[ShaunCorbs]

Eh? Why would they not be equal pressures if it's a combi feeding the shower...?? They're both at whatever the mains pressure is. The hot might be slightly reduced through the plate I spose, but there's millions of mixers run off combis?

thats the only way they could cross

 

[Moffski72]

They've got feckin gremlins then...
OK, cheers for replies