# One more try! Wyze Thermostat - boiler, hydronic, heat only, zone valves, rebooting every few seconds **URL:** \ **Category:** Home\ **Tags:** thermostat\ **Created:** [November 28, 2023, 7:18am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212 "2023-11-28T07:18:13Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 28, 2023, 7:18am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/1 "2023-11-28T07:18:13Z")
I made a run at this problem way back in quarantine times, but eventually put the thermostats on the shelf and moved on from this as yet unsolved problem. Love to get some advice! Ready? Okay. We have a gas-fired boiler. This boiler feeds 3 zones with hot water baseboard heat. Each zone is controlled by a valve (plumber calls it a "power head.) How this works is - when a thermostat calls for heat, the valve opens to let hot water flow, and the valve also trips the boiler circulator pump to switch on. Works great with ordinary two-wire thermostats, one per zone. My approach: I ran a brand new 5-conductor wire to the thermostat through some walls. All these connections are fresh and new. First, I connected the boiler’s 75ma 24vac transformer directly to the Wyze thermostat. Transformer directly to Rc and to C. When I stop here, the thermostat works beautifully. Steady stable power, firmware upgraded, displays temperature. It’s happy humming along on the wall downstairs while the furnace is busy running. So clearly there’s plenty of power from the transformer to open and close valves and run the boiler while my Wyze thermostat is running. But it is not yet controlling the furnace. Next, I connected the thermostat to the zone valve, Zone valve is connected to Rh and W1. I simply copied the wiring from valve to our old, existing thermostat - and redirected those wires to the Wyze thermostat instead. Now, when I switch furnace back on, the Wyze thermostat repeatedly shuts down and reboots every few seconds. It’s got to be something about the Rh-W1 connection to the zone valve that is doing this. Is there logic in the Wyze thermostat that defeats the steady dedicated power I’m already sending to it from from the transformer over Rc and C? Do I need to play with the app some more? Penny for your thoughts! ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 28, 2023, 7:25am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/2 "2023-11-28T07:25:55Z")
Previous entries about this: [New Wyze Thermostat to Control Zone Valves - Wishlist / Probably Not - Wyze Forum](https://forums.wyze.com/t/new-wyze-thermostat-to-control-zone-valves/135202) [Wyze thermostat - does yours reboot when calling for heat? - Home - Wyze Forum](https://forums.wyze.com/t/wyze-thermostat-does-yours-reboot-when-calling-for-heat/163035/1) [Wyze thermostat with zone valves in a hot-water baseboard heat system - Home - Wyze Forum](https://forums.wyze.com/t/wyze-thermostat-with-zone-valves-in-a-hot-water-baseboard-heat-system/146464) As you can imagine I’ve let this issue sleep for a bit after finding no success. Making another run at it today. ---
**Author:** ![topnotcher](https://avatars.discourse-cdn.com/v4/letter/t/a3d4f5/32.png) [@topnotcher](https://forums.wyze.com/u/topnotcher)\ **Post date:** [November 28, 2023, 1:27pm UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/3 "2023-11-28T13:27:34Z")
Do you have a zone controller box? Everything seems to me that there is too much draw on the 24v system causing the T-stat to reset. ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 28, 2023, 8:14pm UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/4 "2023-11-28T20:14:23Z")
No. And I upgraded the thermostat from its original 20va to a new 75va. Doing the math, my 4 existing power heads should leave plenty of juice available for the Wyze thermostat. I mean it could be this, but. Just running the tstat while furnace is operating works fine. Maybe I’m missing a programming thing? ---
**Author:** ![topnotcher](https://avatars.discourse-cdn.com/v4/letter/t/a3d4f5/32.png) [@topnotcher](https://forums.wyze.com/u/topnotcher)\ **Post date:** [November 28, 2023, 9:08pm UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/5 "2023-11-28T21:08:17Z")
My gut is the surge on opening the zone valve is throwing the power off just enough to freak out the T-stat. Holding a valve open might also cause noise that is freaking out t-stat. I had a similar problem a couple of decades ago with a tricked out pinewood derby track and magnetic release gates causing the digital timing system to reset. I’m trying to think of a test for my hunch. But without relays /controller box that might be hard especially with AC power. Do you have a 24vac coil relay that can trip on the thermostat W1 and close the coil on the zone value with a different transformer ? ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 28, 2023, 9:57pm UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/6 "2023-11-28T21:57:45Z")
Hm. Wouldn’t know about a relay. What I do have is the old 20 transformer I suppose could also hook up to just use as a power supply. That kind of scares me a bit having two transformers touching a single thermostat. I can’t be the only person seeing this problem. ---
**Author:** ![topnotcher](https://avatars.discourse-cdn.com/v4/letter/t/a3d4f5/32.png) [@topnotcher](https://forums.wyze.com/u/topnotcher)\ **Post date:** [November 28, 2023, 11:15pm UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/7 "2023-11-28T23:15:18Z")
Using two transformers in the same circuit would not be a valid test. We are ultimately trying to isolate rf noise in an ac circuit. Hard to do without a relay. ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [November 30, 2023, 3:05am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/8 "2023-11-30T03:05:56Z")
Install a 24v isolation relay. Your aquastat (power head) is probably expecting tt and th dry contacts, and the wyze is trying to dump 24v into it. also, It’s unlikely that the Rc of the power transformer and the th (R) terminals are at the same potential, so the wyze might be experiencing spikes of up to 200v on its circuits. ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 30, 2023, 4:00am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/9 "2023-11-30T04:00:27Z")
OK, thanks for laying all this out. I may try this. In fact, googling this relay idea, it looks like many OTHER smart thermostats actually talk about this in their instructions. There’s a nice video that lays it out very simply. [Installing smart thermostat with boiler using a relay - YouTube](https://www.youtube.com/watch?v=QGCahxGqkU4) Why does Wyze ignore such a common situation? Too bad really. ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [November 30, 2023, 4:06am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/10 "2023-11-30T04:06:17Z")
[![](https://us1.discourse-cdn.com/wyze/original/3X/2/6/261a8a6b210b839353dafa48c64b6d7c31b84cbd.png) ](https://us1.discourse-cdn.com/wyze/original/3X/2/6/261a8a6b210b839353dafa48c64b6d7c31b84cbd.png) or [![](https://us1.discourse-cdn.com/wyze/original/3X/5/3/53c268b8b7eb351608297ac087d343fd281ae287.png) ](https://us1.discourse-cdn.com/wyze/original/3X/5/3/53c268b8b7eb351608297ac087d343fd281ae287.png) or [![](https://us1.discourse-cdn.com/wyze/original/3X/0/e/0e1d96ce91b59bdf73094f7d3f67649ba024712e.png) ](https://us1.discourse-cdn.com/wyze/original/3X/0/e/0e1d96ce91b59bdf73094f7d3f67649ba024712e.png) ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 30, 2023, 4:08am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/11 "2023-11-30T04:08:22Z")
nice. So shouldn’t tap the existing transformer for both the thermostat and the valves? that’s my current setup. ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [November 30, 2023, 4:11am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/12 "2023-11-30T04:11:47Z")
depends on how it was wired with your old system- do your valves expect 24v or are they TH and TT (dry) contacts ? ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [November 30, 2023, 4:15am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/13 "2023-11-30T04:15:25Z")
From each one, a pair of yellow wires connect to the two-wire thermostat, and a pair of black wires are attached down at the boiler’s control panel. ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [November 30, 2023, 4:24am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/14 "2023-11-30T04:24:52Z")
Something like this then? they have an internal power supply and dry contacts. ![d6302df479f8973dade90323138f1e702cfcd76f](https://us1.discourse-cdn.com/wyze/original/3X/2/1/216466765062850451c98eb0ae82a7d01d7f9bdf.jpeg) if the previous thermostat only had 2 wires and they both went directly to the aquastat, then you have dry contacts, and it is not expecting to get 24v from an external power supply dumped into it. Pictures of your setup would help me diagnose the exact issue greatly. ---
**Author:** ![mike-mike-mike](https://avatars.discourse-cdn.com/v4/letter/m/db5fbb/32.png) [@mike-mike-mike](https://forums.wyze.com/u/mike-mike-mike)\ **Post date:** [December 19, 2024, 5:33am UTC](https://forums.wyze.com/t/one-more-try-wyze-thermostat-boiler-hydronic-heat-only-zone-valves-rebooting-every-few-seconds/282212/15 "2024-12-19T05:33:05Z")
IT FINALLY WORKED! An old two-wire thermostat finally gave up the ghost to I forced myself to try and get the Wyze working in its place. Instead of buying another cheap thermostat. What worked: the advice above. It was absolutely necessary to have a relay. I don’t get why the thermostat software can’t be adjusted to account for this situation… and provide dry contacts when needed. Thermostat - powering just the thermostat and its display: The Wyze was wired directly to the transformer to power the thermostat itself using Rc and C contacts. This is same existing transformer that already powers the zone valves. Relay - “primary”(? terminology) side: The W1 contact on the thermostat was wired to the primary(?) side of the relay. The other wire to the primary side of the relay came direct from the transformer’s common. Relay - secondary(?) side: The secondary(?) side took the place of the old thermostat. Choose the “normally open” pair of wires from the relay. Just imagine you are dropping in the relay exactly to the same wires and in the same place that your old, two-wire thermostat was connected to. Okay, well. I guess this is a problem for some other smart thermostats too. So strange that our simple furnace and zone valve system isn’t accounted for in the thermostat design.