I've just changed the battery in mine and it is displayin "un boil". It seems to be working though. Does anyone have any idea what "un boil" means?

I had the same issue and emailed esi tech support who responded really quickly - they said it means the thermostat is regulating the boiler temperature so it works more efficiently and shouldn't affect functioning. Full reply below. "The UNBOIL message which appears in place of the date on your thermostat is an OpenTherm notification that is telling you that your boiler will not need to heat the return water any further at the moment as it is already satisfied. Typically, thermostats use electrical voltage to talk to boilers to say either ON or OFF, however OpenTherm works by using a language (called OpenTherm) that works as a load compensator which will regulate your heating by modulating the boiler at specific points to keep your heating at your target temperature far more accurately and will run your boiler more efficiently. The UNBOIL message will not interfere with any functions on your room thermostat and it is normal to see this. If your thermostat was not wired in using the OpenTherm terminals, then it is in effect talking to itself, but it will still not have any negative influence on the operation of your thermostat."

How do you programme this from 4 “events” to 6? It only seems to give 4, despite saying it offers 6.

How to Change From 4 Programs To 6 Programs This is NOT mentioned in the user guide, So I emailed ESI to get the following instructions and I can confirm they work. 1. Move the slider bar to the OFF position. You should see a snowflake on the display. 2. Press & Hold the A button, H button and >> button together. You will see either ON or OFF flashing on the display. Release the buttons. 3. Press & Release the >> button until you see CODE on the display. 4. Press the >> button once more and you will see an error code appear and then disappear. 5. The error code will be replaced by number 4. 6. Use the + button to change the 4 to 6. 7. Press the HOME button to exit the menu. You will now have 6 programmable events instead of 4. To change back to 4 you do exactly the same thing but select 4 in step 6.

My boiler is in manual mode. With teampature turned down to 5 degrees. But the thermostats comes back in to 20 21 degrees. By itself why?

After you set the temperature, the screen will change to the current room temperature.

Will it work with a ideal logic combi 30

Works a treat, I took out my ideal built in RF unit and fitted an ESI, far quicker response and more accurate

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🔥 Stay cozy, save energy, and lead the smart home revolution! 🔥

WIRELESS FREEDOM - RF wireless design means no messy wires—install anywhere and stay connected.
TAILORED SCHEDULING - Choose from 7-day, 5/2, or 24-hour operation for ultimate control over your heating.
SMART ENERGY MASTERY - Auto, Manual, Override & Off modes optimize your comfort and savings effortlessly.
CLEAR INTUITIVE DISPLAY - Large blue backlit LCD ensures easy reading and seamless programming anytime.
PRECISION TEMPERATURE CONTROL - 4 or 6 customizable time and temperature events keep your space perfectly cozy.

The ESI ESRTP4RF+ is a sleek, wireless programmable room thermostat designed for modern energy efficiency. Featuring multiple operation modes, a large backlit LCD, and flexible scheduling options, it empowers professionals to optimize home heating with precision and convenience. Battery powered and wall-mounted, it integrates effortlessly into any smart home setup, delivering comfort and savings with style.

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Manufacturer	ESI Controls
Part Number	0753677550889
Product Dimensions	23.4 x 14.8 x 6.4 cm; 100 g
Batteries	2 AA batteries required.
Item model number	ESRTP4RF+
Size	23.4 x 14.8 x 6.4 cm
Colour	White
Style	Single
Power Source	Battery Powered
Voltage	24 Volts
Item Package Quantity	1
Number of Pieces	2
Display style	lcd
Plug profile	Wall Mount
Certification	energy
Special Features	Programmable
Usage	Boiler
Included Components	1 x Sender, 1 x Thermostat
Batteries included?	No
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Weight	100 g

ESI - Energy Saving Innovation Controls ESRTP4RF+ Wireless Programmable Room Thermostat, White

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