UrgentDiagnostic guide
Home heat not working or blowing cold
In Florida the furnace rarely runs, so when it does fail it is usually a dirty filter, an igniter, or a heat strip — all fixable in one visit.
01 / 04Likely causes
What is usually
behind it.
The shortlist of root causes we find on this call. The truck is stocked for most of these.
- 01Dirty or clogged air filter blocking airflow
- 02Igniter or flame sensor dirty or failed
- 03Heat pump in defrost lockout
- 04Emergency heat relay or heat strip failed
- 05Gas valve or thermocouple out (gas furnace)
- 06Reversing valve stuck in cooling mode
02 / 04Right now
Do this while you wait.
Steps that can save product, prevent damage, and shorten the repair once we are on site.
Do this
- Replace the air filter — a clogged filter triggers high-limit shutoff
- Set thermostat to HEAT and check that the fan is running
- For heat pumps: check if the outdoor unit is iced over
Do not do this
- Do not turn on emergency heat for more than a short backup period — it is expensive
- Do not light a gas pilot without the manufacturer's instructions in hand
03 / 04On the truck
What our tech will check.
The diagnostic flow we run on this call. Most are resolved on the first visit.
- 01Inspect igniter, flame sensor, and heat strips
- 02Test reversing valve and defrost cycle on heat pumps
- 03Check gas pressure and safety limits on gas furnaces
- 04Verify airflow and static pressure across the system
Fast dispatch
Most calls see a tech in under two hours.
First-visit fix
Common parts on every truck.
Documented
Photos and notes attached to your ticket.
04 / 04Related service
This sits under
our hvac service.
Heating, cooling, and air handling for homes — diagnosed honestly and repaired without the upsell theater.
Related problems
Might also be one of these.
Other failures with similar symptoms or in the same trade.
Service request