Eph
EPH CP4D OpenTherm Programmable Wireless RF Room Thermostat
EPH CP4D OpenTherm programmable wireless RF room thermostat with dial for controlling heating on an OpenTherm-compatible boiler.
£77.76
£64.80 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The EPH CP4D is an OpenTherm programmable wireless RF room thermostat manufactured by EPH Controls, supplied with a dial for temperature adjustment. It forms part of the heating control system, communicating with the boiler over an OpenTherm connection to modulate heating output. The wireless RF design allows the thermostat to be sited away from the boiler without a hard-wired link.
Signs this part needs replacing
- Boiler not responding to a heating demand from the thermostat
- Blank or unresponsive thermostat display
- Loss of RF communication between the thermostat and the receiver
- Dial not adjusting the set temperature
- Room temperature readings drifting noticeably from actual conditions
Before you order
- Confirm the boiler is OpenTherm compatible
- Check the existing thermostat model and its wiring arrangement
- Verify the CP4D is the correct model for the system
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| SPECIAL OFFERS EPH | — | — | — |
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
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Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.