Combi · 4 parts · 7 wires
Combi boiler with a wireless thermostat wiring diagram
In short
A combi boiler with a wireless thermostat has no cylinder, no zone valves and no wiring centre. The boiler takes a permanent live, neutral and earth, and the wireless receiver’s relay closes the boiler’s room-thermostat terminals when the thermostat calls for heat.
A working Combi boiler with a wireless thermostat in the simulator. Wire colours follow BS 7671; every terminal is live, neutral, earth or dead, and the meter reads what the circuit is doing.
Every wire, terminal by terminal (7)
| # | From | Terminal | To | Terminal | Colour |
|---|---|---|---|---|---|
| 1 | Fused Spur | L | Combi Boiler | L | Brown (live) |
| 2 | Fused Spur | N | Combi Boiler | N | Blue (neutral) |
| 3 | Fused Spur | E | Combi Boiler | E | Green/yellow (earth) |
| 4 | Combi Boiler | L | Wireless Receiver | L | Brown (live) |
| 5 | Wireless Receiver | N | Combi Boiler | N | Blue (neutral) |
| 6 | Wireless Receiver | E | Combi Boiler | E | Green/yellow (earth) |
| 7 | Wireless Receiver | 4 | Combi Boiler | RT | Grey |
Related
Faults on this system
Other systems
- S-Plan
S-Plan
- S-Plan with a digital room stat
S-Plan
- S-Plan with a type B cylinder thermostat
S-Plan
- Wireless S-Plan
S-Plan
- Y-Plan
Y-Plan
If this is your home: this page is written for heating engineers. Mains wiring and gas appliances are not DIY jobs; call a Gas Safe registered engineer. If you smell gas, leave the building and call the National Gas Emergency Service on 0800 111 999.
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