How to bind/pair a Sunvic wireless radio heating controller to its receiver

The type of plan refers ultimately to the arrangement of the pipes and thus the type and number of valves you have in your system.

This page has explanations of all types (Y, S, W and G (not C)). Y Plan is based on a single three way valve that either allows the hot water from the boiler to the heating circuit, hot water circuit or both.

With S-Plan:

... you can have as many zones as you like, but each zone must have its own valve and thermostat. A popular way is to have 4 valves, 1 for the hot water, 1 for upstairs,1 for downstairs and 1 for say, the conservatory.

The W plan is an older control system.

The G plan is for gravity assisted systems. I couldn't find a "C" plan though.

I've also found this page which has diagrams of the Y-Plan and S-Plan controller circuits. They're quite technical so I'm reluctant to summarise here.

I called a number of Central Heating contractors and also Uponor, the company that makes the controller.

I was told that the clicking noise comes from the soft-fuses inside the controller trying to reset. They said box has failed and needs to be replaced by an electrician. Since the controller is the simplest model in their range, there are no diagnostic LEDs or other features that indicate a fault status, except the clicking noise of the soft-fuse.

The repair should only be about an hours labour plus cost of a new controller box.