2 zone CH but 1 zone heats whole house

[PeteLiggins]

I’d really appreciate some advice.

We moved into a new build 3 story town house last Monday. It’s got a Worcester boiler & 2 wireless thermostats (one by the front door, the other on the first floor landing).

When the downstairs thermostat asks for heat (to warm up the kitchen & lounge) every radiator in the house on all 3 floors gets hot. The upstairs thermostat is definitely not asking for heat.

I’ve checked in the boiler room and there are 2 RF receivers which seem to be paired correctly with the thermostats.

We’ve had the plumber who installed the system & the developer round - but when I tried to explain the problem, they both went straight upstairs and set the upstairs thermostat to ask for heat. The upstairs radiators started warming up (which they should do) and they turned the upstairs thermostat down again.

When I turned the downstairs thermostat up and took them back upstairs to show them the warm radiators, they explained this away as ‘residual heat’ from when they had just turned the upstairs thermostat up.

I’ll definitely be getting both the developer & plumber back again and demonstrating the fault to them properly.

My question is - why is this happening? Any ideas would be greatly appreciated to help me have it out with them!

 

[Riley]

Don’t mention a cylinder though if you don’t have one

 

[Bibbs118]

Just ask him to read my posts. Including this one.

Building regs require 2 heating zones, having one rad come on upstairs does not constitute a heating zone, it constitutes a pipework installation problem that MUST be resolved for the builder to comply with building regs.