SPI-based Receivers on Betaflight 4.4.0 and newer will only sync or bind with ExpressLRS 3.x firmware With the release of ExpressLRS v3.0, updating your Binding Phrase via the WebUI is an even more compelling reason to use a Binding Phrase.

If the other UART is occupied by another peripheral, disconnect it and swap places with the Receiver. Binding can be done with either a hard-coded unique Binding Phrase or in a more traditional way where you put the receiver and transmitter into bind mode, and they link up. Records the default button state of the corresponding category & the status of CCPA. It works only in coordination with the primary cookie.The ES2247B is a two-channel multi-purpose programmer with the flexibility of two or three on/off timings per day and can be configured for 7 day, 5/2 day or 24 hour operation for independent channels (all within the one unit), allowing one product to suit all installations alleviating any potential of incorrect selection. If it starts Blinking Slowly (500ms Blink Pattern), you will need to move the receiver wiring to a different UART.

a Receiver with version string of 3.1.2 will sync and work with a TX Module with firmware version 3.0.1 You are now in the Tools Menu where Lua Scripts can be found. Scroll down and select ExpressLRS Lua Script. Power up your transmitter/radio and use the [BIND] button on the ExpressLRS Lua script, which sends out a binding pulse. The Popup will briefly show up and then disappear. However you say "Turned the thermostat right down but heating stayed on." which does not seem to point to the programmer. A C in the top-right corner should be visible indicating TX module and Receiver are connected and Communicating.

a TX Module with version string of 3.1.2 will sync and work with a Receiver with firmware version 3.0.1 It is designed primarily for separate control of your heating and stored hot water (S or Y plan). The heating and hot water programmes are independent of each other, giving you the opportunity to operate the system in the most energy-efficient and cost-effective manner.

If the ExpressLRS Lua Script is showing a C in the top-right corner alright, but then that line disappears and is replaced with a line saying "Model Mismatch", do not worry. ExpressLRS has detected that the set Model ID in the Receiver is different from the Receiver ID set in the current Model in your Radio Model Configuration. Disconnect the RX and TX wires of the Receiver from the Flight Controller. Reconnect power to the drone or aircraft. Observe the LED on the Receiver once again. SPI-based Receivers on (official) Betaflight 4.3.1 and older will only sync or bind with ExpressLRS 2.x firmware Selecting the most suitable type of Heating Control is an important decision. Once you determine that Programmers & Time Switches are the best solution then the ESi 2 Channel Multi-Purpose Programmer - ES2247B is assuredly worth factoring in to your final decision.If the button is being pressed or pinched, remove the cause of the pressing or pinching. Heatshrink can sometimes press a button on the receiver. a TX Module with version string of 3.2.0 will NOT sync or bind with a Receiver with firmware version 2.4.0 There is a 230 volt and 24 volt model it seems, this is the instructions. https://www.plumbase.co.uk/link/1/h002877_20563_t.pdf

A Receiver flashed or set with a Binding Phrase WILL NOT initiate Manual Binding mode, however many times you try the procedure below. You must first reflash the receiver with the Binding Phrase field disabled and/or unset. Why would you not use a bind phrase though if you're already having to flash the RX anyway? It is designed primarily for separate control of your heating and stored hot water (S or Y plan). The heating and hot water programmes are independent of each other, giving you the opportunity to operate the system in the most energy efficient and cost effective manner. a Receiver with version string of 3.2.0 will NOT sync or bind with a TX Module with firmware version 2.4.0 Using the ExpressLRS Lua Script, look for a C in the top-right corner of the screen which indicates TX module and Receiver are Connected and Communicating. If you'll be updating or reflashing your ExpressLRS firmware into your device anyway, using a Binding Phrase is a no-brainer.The ES2247B is a two channel multi purpose programmer with the flexibility of two or three on/off timings per day and can be configured for 7 day, 5/2 day or 24 hour operation for independent channels (all within the one unit), allowing one product to suit all installations alleviating any potential of incorrect selection. The new range of programmers hold a 3 year guarantee for consumer and installer peace of mind and are focused on value, quality and simplicity, offering an economical and durable solution for households. You can select a short and simple Binding Phrase for your devices before flashing or updating using the field in the ExpressLRS Configurator. If you are using any of the Digital FPV systems like the DJI FPV Air Unit, Caddx Vista or DJI O3 Air Unit, and you wired or connected all six wires to your Flight Controller, you will need to remove the SBUS/DJI HDL wire. Older Radios or those with only one Menu Key will need to long-press the Menu Key to access the System Menu.