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Answer 5 quick questions about your heat pump symptoms and get a likely diagnosis with recommended next steps.
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Note: This diagnosis is based on common symptom patterns and is for informational purposes only. A certified HVAC technician should inspect your system for an accurate diagnosis.
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GET FREE QUOTES| Problem | DIY First | Call a Pro If | Emergency? |
|---|---|---|---|
| Not cooling | Check filter, thermostat, breakers | Outdoor unit not running | 🔴 In FL summer |
| Water leaking | Vinegar flush, check float switch | Still leaking after clearing drain | 🟡 Moderate |
| Ice on unit | Turn to FAN, let melt, change filter | Ice returns within 24 hours | 🟡 Same day |
| Short cycling | Replace filter, check vents | Continues after filter change | 🔴 Mold risk |
| Strange noise | Check for debris in outdoor unit | Hissing (refrigerant), banging | 🔴 Hissing = now |
| Humid home | Check thermostat FAN setting | Persists on FAN AUTO | 🟡 Mold risk |
| Won't turn on | Batteries, breakers, disconnect | All checked, still won't start | 🔴 In FL summer |
| Won't heat | Check thermostat mode setting | AUX heat running constantly | 🟡 Moderate |
The most common causes in order: dirty air filter (check first — causes 40% of not-cooling calls), thermostat set to wrong mode, tripped circuit breaker, or outdoor unit not running. If basic checks don't help, suspect low refrigerant from a leak or a failed capacitor — both require a licensed HVAC tech. In Florida's summer heat, don't wait — get same-day service if available.
In Florida's humid climate, a heat pump removes 10–20 gallons of moisture from the air daily in summer — all draining through a condensate drain line that clogs with algae in Florida's warm conditions. Pour 1/4 cup white vinegar into the drain pan monthly to prevent clogs. If actively leaking, use a wet/dry vac at the exterior drain exit to clear the blockage. If you see water damage to ceiling or walls, call a tech immediately.
This is very common in Florida and almost always indicates an oversized heat pump that short-cycles. When the HP reaches temperature setpoint too quickly, it shuts off before running long enough to remove humidity. Solutions: (1) Thermostat to FAN AUTO (not ON). (2) Raise setpoint 1–2°F to allow longer run cycles. (3) Add a whole-house dehumidifier. (4) Have a contractor verify correct refrigerant charge. Target indoor humidity: 45–55% RH.
Florida heat pumps should be serviced twice yearly — spring (March, before cooling season) and fall (October, before heating season). Each service should include coil cleaning, drain line flush, capacitor test, refrigerant level check, electrical connections, and filter replacement. Skip this in Florida's climate and you'll likely face early compressor failure and drain line flooding. The $160–$300 annual maintenance saves thousands in premature failure costs.
A hissing or bubbling sound from your heat pump typically indicates a refrigerant leak — a serious issue that requires immediate attention. Turn the system off and call a licensed HVAC technician same day. Refrigerant (R-410A or R-32) is both an EPA-regulated substance and potentially hazardous. Operating a system with a refrigerant leak damages the compressor and is illegal under EPA Section 608 regulations.
