Thermostat Not Working

An unresponsive thermostat can hide a healthy heating system that simply isn't getting the signal, and a call sorts out which side has actually failed.

Tap to CallNumber arriving soon

When this becomes an emergency

The screen is dark, or it lights up but ignores every button press.
The number on the display doesn't match how the room actually feels.
Raising the setpoint produces no response at all from the equipment.
The thermostat loses its schedule or reboots itself without warning.

What a pro does

The thermostat is a switch with an opinion about temperature, so testing it means testing both halves. Batteries first, because a dark screen usually isn't more complicated than that. Then the low-voltage wiring, where a corroded terminal, a rodent-chewed run through a crawlspace, or a wire nicked years ago during other work can break the call for heat while the thermostat itself tests perfectly fine. Techs also jump the terminals at the equipment to see whether the system fires with the thermostat out of the picture entirely, which answers the question in about a minute. Placement gets a look as well, since a unit on a cold exterior wall or near a wood stove reads a temperature the rest of the house never experiences.

Frequently asked questions

Why would a wood stove throw off the thermostat?

A stove warming the room where the thermostat hangs makes the device satisfy early, so the furnace stops while bedrooms and back rooms stay cold.

What does a missing common wire actually do?

Smart thermostats want steady power. Without a dedicated common wire they borrow it in ways that cause resets, blank screens and dropped calls for heat on older systems.

Can rodents damage thermostat wiring?

They can, and it happens more than people expect in rural homes and buildings that sit closed up part of the year. A chewed low-voltage run breaks the circuit without any visible sign indoors.

Is replacing the thermostat a reasonable first move?

Only after the wiring and the equipment side have been checked. A new thermostat on a broken circuit behaves exactly like the old one did.

Thermostat Not Working?

Get connected with a local pro now.

Tap to CallNumber arriving soon

Keep going

Heating in Michigan Boiler Leaking Water Emergency Heating Repair Furnace Blowing Cold Air Furnace Making Loud Noise Furnace Short Cycling Heat Pump Frozen Outside No Heat Pilot Light Keeps Going Out Radiators Not Heating

disclaimer: 906 Heating is a free service to assist homeowners in connecting with local service providers. All contractors/providers are independent and 906 Heating does not warrant or guarantee any work performed. It is the responsibility of the homeowner to verify that the hired contractor furnishes the necessary license and insurance required for the work being performed. All persons depicted in a photo or video are actors or models and not contractors listed on 906 Heating.

Same-day and 24/7 emergency services are subject to provider participation, location, technician availability, and demand. Availability is not guaranteed and may vary by market and appointment capacity.

We use cookies and session-based analytics, including session replays (with form inputs masked), to improve this site. See our Privacy Policy.

About · Contact · Privacy · Terms · Disclosure · Sitemap