- HVAC
- Smart thermostats
SIN-COMUNICACION-RECEPTOR
Honeywell Home T6R thermostat: no communication with receiver
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
The NO COMMUNICATION RECEIVER BOX alert on a Honeywell Home T6R means the thermostat has lost its radio contact with the receiver box that drives the boiler. Move the thermostat closer and check the receiver box has power; if it persists, call your installer.
Safety first
Stop and check this first
- The receiver box runs on 230 V and is wired to the boiler: do not open it or touch its terminals; any change is for an installer with the power off.
Safe checks you can perform
- Bring the T6R thermostat closer to the receiver box
- Confirm the receiver box is powered
- Test the boiler from the receiver box button
Leave these tasks to a qualified professional
- Do not attempt this professional task: Signal check and rebinding by the installer
- Do not attempt this professional task: Receiver box relocation or electrical check
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Signal check and rebinding by the installer
What they doThe installer uses the Binding item in the thermostat advanced menu to check the radio signal and, if needed, clear and redo the binding with the receiver box.
They must show youthe RF check carried out from the Binding menu and the receiver box LED blinking yellow during binding.
In writingwhether binding was redone, the RF check result and the final thermostat location.
Receiver box relocation or electrical check
What they doIf the receiver box has no power or sits against metal, a competent installer inspects or moves it with the 230 V supply switched off.
They must show youthe supply voltage at the receiver box, its distance from metal objects and the terminals wired to the boiler.
In writingwhat was changed, the new location and the final boiler firing test.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Bring the T6R thermostat closer to the receiver box
- Who:
- you, if your T6R sits on a table stand or can be moved without tools.
- How:
- take the thermostat nearer to the receiver box, keeping it away from large metal objects, and give it a few minutes for the receiver communication icon to return.
- Result that matters:
- finding out whether the alert comes from distance or obstacles in the signal path.
- If the alert clears near the receiver box:
- choose a permanent spot closer to it.
- If the alert stays even right beside the receiver box:
- check whether the box has power.
- Evidence to keep:
- a photo of the alert and a note of the position where it cleared.
Evidence: T6 / T6R Smart Thermostat User Guide
Confirm the receiver box is powered
- Who:
- you, looking at the receiver box without opening it.
- How:
- check the receiver box LED; the installation guide says it shows green after power up. Also check at the consumer unit that the breaker for the boiler and receiver box circuit is on.
- Result that matters:
- ruling out a switched-off receiver box before calling anyone.
- If the LED was off and comes back when you reset the breaker:
- wait for the thermostat to regain contact.
- If the breaker trips again or the LED stays dark:
- stop there and call the installer.
- Evidence to keep:
- a photo of the receiver box LED and the breaker position.
Evidence: T6 / T6R Smart Thermostat User Guide · T6R Smart Thermostat Wall Mount installation guide
Test the boiler from the receiver box button
- Who:
- you, pressing the button on the front of the receiver box.
- How:
- the T6R installation guide explains that pushing the receiver box buttons checks whether the boiler or valves switch, and that the buttons light green.
- Result that matters:
- telling a radio fault apart from a fault in the boiler or its wiring.
- If the boiler responds to the button:
- the problem lies in the radio link with the thermostat.
- If the boiler does not respond even from the receiver box:
- the installer needs to check the boiler and wiring.
- Evidence to keep:
- a note of whether the boiler fired when you pressed the button.
Evidence: T6R Smart Thermostat Wall Mount installation guide
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- HVAC
- Brand
- Honeywell Home
- Product type
- Smart thermostats
Known code variants
- Honeywell Home T6R no conecta con el receptor
- Honeywell Home T6R receiver box not communicating
- Honeywell T6R alerta receptor
- Honeywell T6R no communication receiver box
- Honeywell T6R sin comunicación con el receptor
- Lyric T6R no communication
- Lyric T6R receptor sin comunicación
- NO COMMUNICATION RECEIVER BOX
- Resideo T6R receiver box alert
- Resideo T6R sin comunicación
- SIN COMUNICACION CON EL RECEPTOR
What it means
In the Resideo (Honeywell Home) T6 / T6R Smart Thermostat user guide, the list of alerts includes NO COMMUNICATION RECEIVER BOX, explaining that there is no communication with the Receiver box and that you should move the thermostat closer or contact your installer. The receiver box sits near the boiler, takes commands over 868 MHz radio and needs 230 V. Without that link the heating no longer follows the thermostat. The alert alone never proves that a part has failed, and other models or firmware may word it differently.
Warnings and stop conditions
- Mediumsource verified
The receiver box runs on 230 V and is wired to the boiler: do not open it or touch its terminals; any change is for an installer with the power off.
Evidence: T6R Smart Thermostat Wall Mount installation guide
Symptoms and causes
Probable causes · in order
- Thermostat too far from the receiver boxCommon
The Resideo guide's first suggestion is to move the thermostat closer, which points to a weak radio signal between the two units.
Evidence: T6 / T6R Smart Thermostat User Guide
- Receiver box without powerPossible
The receiver box needs 230 V to work; if its circuit is off or a breaker has tripped, the thermostat cannot talk to it.
Evidence: T6 / T6R Smart Thermostat User Guide · T6R Smart Thermostat Wall Mount installation guide
- Receiver box mounted near metalPossible
The installation guide asks for at least 30 cm between the receiver box and any metal object, including wall boxes and the boiler housing.
Evidence: T6R Smart Thermostat Wall Mount installation guide
- Binding lost between the unitsLess common
If the binding has been cleared the guide shows a different alert, and the installer has to redo the pairing from the advanced menu.
Evidence: T6 / T6R Smart Thermostat User Guide · T6R Smart Thermostat Wall Mount installation guide
Virtual technician
Does SIN-COMUNICACION-RECEPTOR still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
T6 / T6R Smart Thermostat User Guide
Resideo · 2020 · manual
- 2
T6 / T6R Termostatos inteligentes Guía de usuario
Resideo · 2020 · manual
- 3
T6R Smart Thermostat Wall Mount installation guide
Resideo · 2021 · manual
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