Thermostat not working
Blank screen, wrong mode, missing C-wire.
A blank Ecobee after a power blip is not automatically a dead furnace.
Blank thermostats, wrong mode, and dead C-wires create “no heat” calls that are not furnace failures.
If the search that brought you here was “thermostat not working,” start with a test, not a replacement pitch.
We verify power, mode, and whether a communicating control is actually talking to the board before we open the gas valve.
On this call we confirm the symptom you described — thermostat not working — before we open a price book.
You approve any repair after the findings are written down. Diagnostic visits are a flat $69. New installation estimates are free in-home with a load calculation — not a number invented from square footage on Zillow.
A Nest on a heat pump set to “gas furnace” will look like the outdoor unit is broken.
A company that skips testing on thermostat not working will skip it on the next call too. We would rather lose a job than install the wrong thing.
Related service page on this site: thermostat installation. The article you are reading is the explanation; that page is how to book the work.
OTTER HVAC is based at 2939 Santos Ln, Walnut Creek. Concord, Alameda, and Lafayette are regular routes, along with the rest of our listed East Bay cities. Hours are 7am–5pm, seven days a week. We do not advertise 24/7 because we do not staff a night shift.
Inland heat (Pleasanton, Livermore, Concord) and marine air (Alameda, Daly City) are different loads. A note written for Concord is not automatically right for a fog-belt house. We treat them that way.
Category on this guide: Controls. Primary search phrase: thermostat not working.
Call (650) 900-0440 or book online. Tell us the city, the symptom in one sentence, and the brand if you know it. If we have a window today, we will say so. If we do not, we will say that too.
Technicians are EPA 608, OSHA, and NATE certified. Public reviews average 5.0 stars across roughly 146 Google and 151 Yelp reviews. That does not replace a test on your unit.
Related service: Thermostat Installation. Book a $69 diagnostic or a free install estimate. Hours: 7:00am–5:00pm, seven days a week. Shop: 2939 Santos Ln, Walnut Creek, CA 94597.
Related: All HVAC guides · Thermostat Installation · Pricing and $69 diagnostic · Contact OTTER HVAC
Frequently asked questions
What do you test on a thermostat not working visit?
We verify power, mode, and whether a communicating control is actually talking to the board before we open the gas valve. The visit is a flat $69. Repair work starts only after you approve the written findings.
Will you quote thermostat not working from a photo?
No. We do not price thermostat not working from a driveway photo. $69 diagnostic, then a quote — or a free in-home install estimate if replacement is the honest path.
Do you handle this in Concord and Alameda?
Yes. We run Concord, Alameda, and the rest of our East Bay list from 2939 Santos Ln, Walnut Creek. Hours are 7am–5pm every day — not 24/7. Call (650) 900-0440.
Explore related pages
References and credentials
- U.S. DOE Energy Saver
- EPA Section 608
- EPA Section 608 refrigerant certification
- U.S. Department of Energy — Energy Saver
Authority sources: U.S. DOE Energy Saver · EPA Section 608