Heated Floor Thermostat Replacement in Sammamish, WA 98075: Why Ryan's Mudroom Floor Went Cold

Location: 222nd Ave SE corridor, Sammamish, WA 98075

Call Date: September 4, 2026

First Visit: September 10, 2026

Project Completion: September 11, 2026

Lead Technician: Brandon John, 10 years in electrical, 02 residential electrician

System Before: Electric in-floor heat in the mudroom of a 1963 home renovated in 2022, stopped working about a month earlier, with the homeowner's breaker and thermostat resets failing to bring it back. Because traced to a failing thermostat, a model since discontinued

System After: The mudroom floor-heat thermostat replaced with a newer SunTouch 120V thermostat, floor heat working again. Whole-home surge protection and panel labeling quoted and left on file

Final Project Cost: $830.00 (thermostat replacement, as sold on the estimate, including $25.00 in general electrical material)

Ryan's mudroom has heated floors, which went in during a renovation of his 1963 house on the 222nd Ave SE corridor in Sammamish, the same renovation that updated the home's electrical panel in 2022. About four years later, in the late summer of 2026, the mudroom floor stopped warming. The mudroom at this was at the front entrance, the room everyone walks through with wet shoes, and it is the one room in a Pacific Northwest house where a warm floor earns its keep.

Ryan did what most homeowners do first. He tried resetting the thermostat and the breaker. Neither worked. When he booked, he wrote: "I have tried to reset the unit and the breaker but cannot resolve the issue, and so we need help in reviewing the electrical issue causing the problem."

Why Ryan Called an Electrician After Resetting It Himself

Ryan was a new Product Air customer. He called on September 4, 2026, said the problem had started roughly a month earlier, and asked for the work to be done within two weeks. The visit was booked for the afternoon of September 10. When Brandon arrived, Ryan showed him the mudroom and told him he had tried everything he could. A thermostat reset and a breaker reset are the right first moves, and they are where a homeowner should stop. Past that point, the next steps involve opening a line-voltage thermostat and testing live circuits. Brandon's view, from the field, is that most homeowners think 120-volt electricity is not dangerous, and that it is exactly the voltage people get careless with. Ryan called instead, and his floor heat turned out to run on a 120-volt thermostat. No other contractor had been involved.

What the Heated Floor Call in Sammamish, WA 98075 Actually Found

Brandon has 10 years in electrical work and is an 02 residential electrician. On this call he tested at the thermostat with a Volt meter, reading the current on the floor-heat wiring at the wall box, and checked the circuit back at the panel in the laundry room.

The cause was the failing thermostat. The heating element under the tile was not the problem. The thermostat that controls it was, and the model that had been installed during the renovation had since been discontinued, so a like-for-like replacement was not available. The fix was a newer model.

The panel told its own story. Its directory lists three separate floor-heat circuits, for the mudroom, the primary bathroom, and the kids' bathroom, alongside the pumps, kitchen, and other renovation circuits. The panel also carries the City of Sammamish electrical approval from the 2022 work. Brandon's observation was that this was a home that was done right, with permits and inspections, and that made it the odd one out. Most homes the team visits in the area show DIY work or work clearly done without permits and inspections. In one week of visiting 10 different homes, Brandon found seven with electrical work done incorrectly or done as DIY.

Why Did My Heated Floor Stop Working?

Electric floor heat has three parts: the heating cable or mat embedded under the tile, the circuit and breaker that feed it, and the thermostat that switches it on and off. When the floor goes cold, the question is which of the three failed. The breaker is the easiest to check, which is why homeowners reset it first. The heating element is the hardest to reach, because it is set in mortar under finished tile. The thermostat sits in between, on the wall, and it is also the part that does the most work: it senses the floor temperature, switches the full heating load, and on some floor-heat systems carries the ground-fault protection as well.

That last point matters for anyone troubleshooting at home. SunTouch, for example, builds a GFCI into its floor-heating thermostats and instructs owners to test it when installation is finished and once a month after that, using the TEST button, which cuts power to the floor heating. A floor that has stopped heating may simply be sitting in a tripped state at the thermostat, which is the first thing worth ruling out.

On Ryan's floor, the reset did not bring it back, and testing pointed to the thermostat itself. Because the thermostat is on the wall rather than under the tile, that is the best-case failure for a heated floor: the repair is a thermostat swap, not a tile job.

Do You Have to Replace a Failing Floor-Heat Thermostat Right Away?

Not always, and Brandon said so. He gave Ryan two options, one of which cost nothing: do nothing and wait until the thermostat fully fails. A failing floor-heat thermostat is a comfort problem, and a cold mudroom floor was the whole complaint. The other option was to replace it now with a current model.

Offering the no-cost option is the honest way to handle a call like this. A floor that is cold in September is not the same problem as a floor that is cold in January, and the homeowner is the one who gets to decide how much that matters. Ryan chose the replacement.

The Plan: Wait for Free or Replace It Now

The options on the table, including the two add-ons Brandon also quoted while he was at the panel, were:

Ryan took the thermostat replacement and left the surge protection and panel labeling on file. The decision was his. Brandon's account is that Ryan appreciated the approach of education first, with him making the call on what was best for him and his family.

What Product Air Did in the Mudroom

Brandon removed the failed mudroom floor-heat thermostat and installed a SunTouch 120V thermostat in its place, connected it to the existing floor-heat wiring, and confirmed the floor was heating again. According to the technician's notes, it was a straightforward swap of about 30 to 60 minutes, with no utility disconnect involved. The work falls under electrical repair and troubleshooting.

Two Days, One Electrician, on 222nd Ave SE

Ryan called on September 4, 2026. Brandon's visit was on the afternoon of September 10 at the house on the 222nd Ave SE corridor, and the job was closed out on September 11. There was nothing non-standard about the work itself. What was unusual was the house: a renovation done with permits and inspections.

The Real Number: $830.00

The thermostat replacement was sold at $830.00, which included special-order parts and additional labor for the discontinued model, plus $25.00 in general electrical material. The surge protection options, at $532.50 and $1,129.50, were not taken. The no-cost option of waiting was available and was not chosen.

Electrical work does not carry rebates in most cases, and none applied here. How Ryan paid for the visit was not recorded on the job. For homeowners deciding on larger electrical work, such as the surge protection and panel labeling left on file here, Product Air works with GreenSky and Service Finance Company, LLC, and most applications get a decision in minutes. Financing is subject to credit approval.

What It Means for Ryan Going Forward

Ryan's mudroom floor heats again, on a thermostat that is a current model rather than a discontinued one, so the next failure, whenever it comes, will not start with a parts search. The home has two more floor-heat circuits, in the primary and kids' bathrooms, and those thermostats date from the same renovation.

Heated floors are now a normal part of remodeling in this area. Brandon's observation is that every remodel and new construction project the team has seen for the past two years includes electric in-floor heat under tile. As those systems age, fall is a reasonable time for an electrical safety check on each floor-heat circuit and its thermostat before winter.

Where This Job Fits: Our Issaquah Team

This job was handled by our Issaquah team, the crew that covers Issaquah and the Eastside. That location covers King County, including Sammamish, Bellevue, Redmond, Kirkland, and Woodinville. You can see reviews from that area on our Issaquah Google Business Profile.

FAQ

Why did my heated floor stop working?

An electric heated floor has three parts that can fail: the heating element under the tile, the circuit and breaker feeding it, and the thermostat that controls it. The breaker is the easiest to check and the heating element the hardest to reach. The thermostat, on the wall, is the easiest of the three to replace. In one Sammamish mudroom in September 2026, breaker and thermostat resets did not help, and testing traced the problem to a failing thermostat, a discontinued model, which was replaced with a newer SunTouch unit.

Does a heated floor thermostat have a GFCI?

Some do. SunTouch, for example, builds a GFCI into its floor-heating thermostats and tells owners to test it when installation is finished and once a month after that with the TEST button, which removes power from the floor heating. A tripped GFCI at the thermostat can make a working floor look dead, so it is worth checking before calling. A Sammamish homeowner whose mudroom floor stopped heating in 2026 had already tried resetting the unit and the breaker, and the thermostat itself turned out to be failing.

How much does it cost to replace a heated floor thermostat?

It depends on the model and whether the original is still available. On one Sammamish job in September 2026, replacing a discontinued mudroom floor-heat thermostat with a newer SunTouch 120V thermostat was $830.00, including special-order parts and $25.00 in general electrical material. The homeowner was also offered the option of waiting until the old thermostat failed completely, at no cost.

Can I wait to replace a failing floor-heat thermostat?

Often, yes. A failing floor-heat thermostat is usually a comfort problem rather than a safety emergency, so waiting until it fully fails can be a reasonable choice, especially outside the cold months. On a Sammamish call in September 2026, the electrician offered exactly that as a no-cost option alongside an $830.00 replacement. The homeowner chose to replace it.

Is it safe to troubleshoot a heated floor thermostat myself?

Resetting the thermostat and the breaker and pressing the GFCI test and reset buttons are safe homeowner steps. Opening the thermostat or testing the wiring is not, because floor-heat thermostats switch line voltage, and in the experience of Product Air's electricians, 120 volts is the voltage people most often underestimate. A Sammamish homeowner in 2026 did the resets, stopped there, and called an electrician, which is the right order.

Who issues electrical permits in Sammamish?

The City of Sammamish issues its own electrical permits and runs its own inspections, rather than Washington L&I, with applications handled through MyBuildingPermit.com. On a Sammamish house with heated floors visited in September 2026, the panel carried the city's electrical approval from a 2022 renovation, and the electrician noted it as a home done right, with permits and inspections, which he sees less often than he would like.

Key Takeaways

• When an electric heated floor stops working, the thermostat on the wall is the most accessible suspect and the best-case failure, not the heating element under the tile.
• SunTouch floor-heat thermostats have a built-in GFCI that the manufacturer says to test monthly, and a tripped one can make a working floor look dead.
• A failing floor-heat thermostat is usually a comfort problem, not an emergency, so waiting until it fully fails can be a legitimate no-cost option. Ryan chose to replace his instead, at $830.00.
• In one week of visiting 10 homes, Product Air's electrician found seven with electrical work done incorrectly or done as DIY. This permitted, inspected 2022 renovation was the exception.

Ryan had already done everything a homeowner should do before he called. What he needed was someone to find out which part had failed, tell him honestly that he could wait, and let him decide. His mudroom floor is warm again ahead of the winter.