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All problems
UrgentElectrical
Thermostat Not Working
Blank screen or unresponsive thermostat — usually a quick wiring or power fix.
Call (209) 216-7240Symptoms you're seeing
- Blank or dim thermostat display
- Won't change temperature setting
- System won't turn on no matter what you press
- Wi-Fi thermostat keeps disconnecting
What's actually causing it
Most likelyDead batteries (battery-powered models)
CommonTripped float switch (A/C drain backup)
CommonBlown low-voltage fuse on furnace control board
CommonMissing or loose C-wire (smart thermostats)
PossibleFailed transformer
What to do right now
- 1Replace thermostat batteries first
- 2Check the furnace door panel is closed (door switch)
- 3Pull the thermostat off the wall — verify wires are seated in terminals
- 4Reset the breaker to the furnace/air handler
When to call us
If batteries don't fix it within 10 minutes, you likely have a tripped safety or blown fuse — call us before you mess with wiring.
Estimated cost
$185–$350 for fuse, transformer, or wiring fix. New thermostat install: $250–$650.
We fix this in your town
Same-week service across the Central Valley.
FAQs
Why does my smart thermostat keep rebooting?
Almost always a missing C-wire. Without continuous 24V power, it brown-outs when calling for heat or cool. We can pull a C-wire or install an adapter.
Can I install a smart thermostat myself?
If you have a C-wire and a simple system, yes. Multi-stage and heat-pump systems benefit from professional setup to avoid efficiency loss.