How to Fix Honeywell T3/ T3R & T4 /T4R Screen Keeps Resetting / Keeps Restarting / Keeps Rebooting.

This is a very common fault, luckily it is fairly straight forward to fix the fault and stop it from resetting. I will show you how to do this with easy to follow step by step instructions.
So by the time you have finished watching my video you should have your Honeywell T3,T3R running like new.

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Chapters

0:00 How to Fix Honeywell T3R Screen Resetting.
16:04 Putting the Honeywell T3R back together.

Links To My Other Help Videos.

VIDEO: How to use the Honeywell T3 & T3R Programmable Room Thermostat.
Sep-up, programming, operation and lots more.

VIDEO: Easiest way to turn your heating on and off, Honeywell T3 / T3R.

Video: How to Factory Reset the Honeywell T3 and the T3R.

VIDEO: How to Bind Honeywell T3R / Pairing Honeywell T3R.

VIDEO: T3R versus the T4R head to head comparison.

VIDEO: How to Use the Honeywell T4 / T4R Programmable Room Thermostat
Sep-up, programming, operation and lots more.

VIDEO: How to Bind Honeywell T4R / Pairing Honeywell T4R.

VIDEO: Honeywell T3r & T4R 3 ways to wire them up.

VIDEO: Replacing an old Honeywell CM927 with Honeywell T3R.

VIDEO: How and Why you should add "INHIBITOR" to your heating system. Including "System Cleaner" and other "Chemicals"..

VIDEO: 10 Money Saving Heating Tips. Simple Things You Can Do Which Will Improve Efficacy, Save Gas and Save You Money.

VIDEO: How to Fix a Radiator NOT Getting Hot! Most common Reason.

VIDEO: How to Balance your Central Heating System, Reduce Your GAS BILL.

VIDEO: How to replace a Central Heating Pump. All you need to know. With out draining the system.

VIDEO: How to bung a loft tank.

VIDEO: How to Operate Vaillant ecotec Plus Combination Boiler.

VIDEO: How to replace a leaking radiator valve. With out draining the system.

VIDEO: How to replace a Radiator with out draining the system.

VIDEO: How to add Inhibitor to a Magna Clean Professional 2

VIDEO: How to clean the Adey Magna Clean Professional 1

Video: How to Install Adey Magna Clean Professional 2.

VIDEO: How to Remove an Olive. 5 Different Ways.

VIDEO: Is your boiler continuously losing pressure. What's the problem.

VIDEO: How to clean Vaillant Filter/ Spirotech Filter. Vaillant Protection Kit.

VIDEO: How to clean Vaillant Filter Version 2. Vaillant Protection Kit.

VIDEO: How to remove a radiator for decorating.

VIDEO: How to refit a radiator after decorating..

Recommended Tools.

VIDEO: Review "Monument 15mm Olive Cutting Tool".

LINK: Nerrad Fire Jet Blow Torch. Highly Recommended.

VIDEO: Einhell Classic TC VC1930S Wet & Dry Vacuum Review, 30L 1500watt.

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[stephenhenderson]

WTAF! I dropped my T3r and it completely broke. Dead. I followed your guide fully expecting nothing. And it fixed it! Batteries back in gave it a wiggle and it came back on!!! Saved me £60. Many many thanks!!

[tonytuckwell]

Superb Video - thank you SO much Mark. I came in search of how to program one of these and found one of your other videos.... and it reset while I was programming it... so that fact that you mentioned that they are prone to doing this.. AND did a separate vid to show this, was absolutely spot on. Personally, I bent the battery box contacts, cleaned them with IPA and scratched them up a bit and that fixed it . but if it does it again I'll open the box and actually solder the contacts to the board with small bridging wires. 10/10 VID.

[markmackinnon]

Thanks for sharing this. My thermostat has been resetting itself every time I touched it for months now, driving me mad. It’s fixed now thanks to your advice.

[sharpnosepointer]

Thanks so much Mark for this video. I was about to buy a new T3R because of this problem but now it seems to be fixed after following your careful instructions. Have also used your pairing video when I lost connection a while ago and it worked perfectly. Again many many thanks !!

[richardpountney]

Thanks, clear and concise and (fingers crossed), has solved the irritating issue

[shellster]

Such a useful and detailed video, Mark. Many thanks. Found this when looking to see if we could connect to an app, and saw the exact problem we often get. No idea it was a common fault

[ArikCool]

You just saved me £200. Basically the golden connector was rusted as well as the metallic contactor had lime scale. It worked after cleaning.

[andrewkendall]

Thanks! Good to know this is a known issue. I've put up with this for four years. Hopefully it's now sorted.

[geoffbuckley]

I emailed the manufacturer when I first noticed this fault and they seemed to think that I needed to replace the unit. No mention of a fix. So I did tweak the battery connectors in the compartment and that helped as the fault became very occasional. Great video as I'm now tempted to remove the motherboard to finish the job. I found that handling the unit only at the sides does tend to help.

[thejammod]

It worked! Saved me a few quid. In my case I only had to pull the battery terminal out a bit.

[nondeblah]

Corroded battery contact on ours. 3 yrs old. Your vid pointed me in that direction -- thx much.

[bri-annaedwardine]

Thank you so much for this video! When my thermostat lost its display and only displayed a light but nothing else, I was floundered. I dont even know if I have a guarantee. Anyway, long story short I did what your video shows. OK not as neatly I figured it was broken anyway... but now I have a functioning thermostat! Thanks so much as I live in cold climate.

[niikiiniikii]

Great info, I have been looking at how to fix this naughty issue. Now I know. Thank you.

[bluebear]

Thanks a lot, very helpful!! Additionally, guys don’t forget to change the batteries too 😉

[MoxieSofia]

Saved my New Year’s Eve!!! Thank you 🙌🏼

[georgesimons]

Brilliant video - thanks so much. Very clear and resolved a very annoying fault

[unitedgas]

I recalled a few of these off customers and ended up binning them, I will remember this for any in the future.. Honeywell where no help at all. Thankyou very much

[GrahamWilliams-ol]

Thanks for your excellent video - so glad I found this because I had thought I would need to buy a new programmer.

[momosilva]

OMG - As comment below I dropped it too and the poxy thing stayed dead no matter what I tried. As below, it was a battery tweak. Thank you as I am no longer plunged in Siberia 😂

[keithharrison]

Good video! Not just me then! We had a new IDEAL Boiler a year or two ago, and it came with one of these wireless Honeywell things. When it works, no problem but, as this video covers, the thing is temperamental, and does indeed keep going back to the Setup Screen when it's having a bad hair day! I will whip ours apart and sort out these connections (more than capable of doing that). I thought it was just a lemon controller, so this was a timely video to pop up on my Notifications. I must say the Setup and Manual are cryptic, making it way harder than it actually is, so I think it's just a very badly written Manual. On that note, I must watch the Setup Video next.