Heat Pump Repair — Los Angeles
Heat pump not heating, not cooling, stuck in defrost, throwing a fault code, or making unusual noise? AIRONE diagnoses and repairs all heat pump configurations same day in most areas. Reversing valve, defrost cycle, refrigerant, and electrical faults. $89 diagnostic applied toward repair. EPA 608 certified. CA License #114807.
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Heat pump failures have distinct root causes from standard AC or furnace failures. The reversing valve, defrost system, and dual-mode refrigerant circuit are heat-pump-specific components that require specialized diagnostic training. AIRONE technicians are trained on all three. $89 diagnostic applied toward repair if you proceed.
Running in heating mode but producing cool or room-temperature air. Most common causes: failed reversing valve stuck in cooling position, defrost cycle fault preventing normal heating operation, low refrigerant reducing heat transfer capacity, or failed capacitor preventing compressor startup in heating mode. Heat pump heating failures are not diagnosable with standard furnace troubleshooting — the reversing valve must be specifically tested.
Get Same-Day Diagnosis →Running in cooling mode but not removing heat from the home. Heat pump not-cooling diagnosis differs from standard AC diagnosis because the reversing valve can be stuck in the heating position, preventing the cooling cycle entirely. Other causes include failed capacitor, low refrigerant from a system leak, or a dirty condenser coil. The reversing valve must be verified alongside standard refrigerant and electrical checks.
Get Same-Day Diagnosis →A normal heat pump defrost cycle lasts 5 to 15 minutes and occurs every 30 to 90 minutes during heating operation in cool weather. A system entering defrost every few minutes, never leaving defrost mode, or blowing cold air continuously during what should be heating mode typically indicates a failed defrost control board, a faulty defrost thermostat sensor, or a refrigerant charge problem causing abnormal frost accumulation on the outdoor coil.
Get Same-Day Diagnosis →Heat pump fault codes indicate specific system failures detected by the unit's control board. Common codes point to reversing valve faults, defrost sensor failures, refrigerant pressure faults, communication errors between indoor and outdoor units, or compressor protection events. Fault code meanings vary by brand — Carrier, Trane, Lennox, Mitsubishi, and Daikin each use different code formats. AIRONE technicians are trained on all major brand heat pump fault code systems.
Get Same-Day Diagnosis →A clicking or gurgling sound during the transition between heating and cooling modes is normal — this is the reversing valve switching refrigerant direction. Abnormal sounds include: grinding or squealing from a failing outdoor fan motor bearing, rattling from a loose or damaged outdoor fan blade, a loud bang at startup indicating compressor hard-start issues, or continuous hissing that indicates a refrigerant leak at a connection point.
Get Same-Day Diagnosis →Light frost on the outdoor coil during heating mode is normal and cleared by the defrost cycle. Heavy ice accumulation that covers the entire outdoor unit and does not clear after a defrost cycle indicates a defrost system failure, severely low refrigerant, a blocked outdoor coil, or a malfunctioning defrost thermostat. A fully iced outdoor unit operates at severely reduced capacity and can damage the compressor if left unaddressed.
Get Same-Day Diagnosis →Don’t see your symptom? Call (323) 471-1037 — describe what your heat pump is doing and AIRONE will tell you what is likely wrong and how quickly it can be fixed.
Heat pump diagnostics go beyond standard AC checks. Every AIRONE heat pump repair visit includes these heat-pump-specific checks in addition to the standard refrigerant and electrical inspection.
| Repair Type | Typical Cost Range | Notes |
|---|---|---|
| Diagnostic fee | $89 | Applied toward repair if you proceed |
| Reversing valve replacement | $400–$1,200 | Wide range — depends on system size and brand |
| Reversing valve solenoid coil only | $150–$350 | When valve body is intact and only solenoid has failed |
| Defrost control board replacement | $300–$700 | Most common defrost system repair |
| Defrost thermostat / sensor replacement | $100–$250 | Common cause of defrost cycle faults |
| Capacitor replacement | $150–$350 | Common cause of no-start and reduced efficiency |
| Refrigerant recharge | $200–$500 | Price varies by quantity and refrigerant type |
| Refrigerant leak repair + recharge | $250–$1,200 | Depends on leak location and system access |
| Outdoor fan motor replacement | $250–$600 | Varies by brand and capacity |
| Circuit board replacement (outdoor) | $450–$950 | Includes inverter board if applicable |
| Circuit board replacement (indoor) | $400–$900 | Varies by brand and model |
| Compressor replacement | $1,200–$2,800 | Major repair — system age and cost-effectiveness reviewed |
| Full heat pump replacement | Contact for quote | When repair is not cost-effective; IRA §25C eligible |
Prices reflect typical Los Angeles market ranges for parts and labor as of 2026. Your exact cost depends on system brand, part availability, and repair complexity. AIRONE provides a flat-rate quote before any work begins.
If a heat pump repair costs more than 40% of the cost of a new AHRI-matched replacement system and the unit is over 10 years old, replacement typically delivers better long-term value. Compressor failure on a heat pump over 8 years old is almost always a replacement decision. Replacement of a qualifying heat pump system may be eligible for the IRA §25C federal tax credit up to $2,000 — making the net cost of replacement lower than the sticker price. AIRONE provides both repair and replacement cost at every diagnostic visit. View Heat Pump Installation →
AIRONE repairs all major heat pump brands across LA County, South Bay, and Orange County. EPA 608 certification and heat-pump-specific training — reversing valve, defrost system, and dual-mode refrigerant circuit — required on every technician.
Carrier is among the most common heat pump brands in Southern California. AIRONE services all Carrier residential heat pump models including Infinity, Performance, and Comfort series. Carrier Infinity communicating systems use proprietary diagnostics that require brand-specific fault code training.
Infinity variable-speed, Performance two-stage, Comfort single-stage — all models serviced.
Trane XV and XR heat pump series are common in newer LA construction. AIRONE services all Trane heat pump configurations including XV variable-speed systems with TruComfort technology. Trane fault codes are retrieved via the thermostat display on communicating systems.
Trane XV, XR, XB series — all models serviced.
Lennox XP heat pumps are installed across Los Angeles County and the South Bay. AIRONE services the full Lennox residential heat pump range. Lennox iComfort communicating systems require specific diagnostic training — AIRONE technicians are trained on iComfort fault retrieval.
Lennox XP21, XP20, XP17 series — all models serviced.
Mitsubishi Electric and Daikin ductless heat pump mini-splits are the leading brands in the LA ductless market. Reversing valve failures in ductless heat pumps require brand-specific diagnostic training — the reversing valve solenoid operates differently in Mitsubishi Hyper Heat systems vs standard mini-split heat pumps.
Mitsubishi M-Series, MXZ, Daikin Aurora — all models serviced.
AIRONE services Rheem Classic Plus and Prestige heat pump series, Goodman residential heat pumps (common in budget-tier LA installations), and York Affinity and LX heat pump lines. All three brands use relatively standardized defrost and reversing valve configurations that enable efficient diagnosis.
All current residential models from these brands serviced.
AIRONE also services American Standard, Bryant, Bosch, LG, Fujitsu, Amana, Heil, and most other residential heat pump brands installed in Southern California. Don’t see your brand?
Call (323) 471-1037 — we service virtually every brand in the SoCal market.
AIRONE gives you both cost figures at every diagnostic visit. Here is the decision framework.
The reversing valve and defrost control system are heat-pump-specific components that most general HVAC technicians encounter infrequently. AIRONE technicians are specifically trained in reversing valve solenoid testing, defrost board diagnosis, and dual-mode refrigerant circuit behavior — the diagnostic skills that separate a correct heat pump diagnosis from a misdiagnosed one that results in unnecessary parts replacement.
AIRONE charges a flat $89 diagnostic fee for every heat pump repair call. If you proceed with the repair, the $89 is applied toward the repair cost. The diagnostic is the foundation of every correct repair — it identifies the actual failure, not a guess. Replacing parts without a complete diagnostic on a heat pump frequently results in replacing the wrong component and missing the real cause of the failure.
Heat pump refrigerant work — recharge, leak repair, recovery — requires EPA Section 608 certification under federal law. Heat pump refrigerant systems behave differently than standard AC systems because the refrigerant flow reverses seasonally, creating different pressure profiles in heating vs cooling mode. AIRONE technicians hold EPA 608 certification and are trained specifically in heat pump refrigerant diagnostics across both operating modes.
After the diagnostic, AIRONE provides a flat-rate repair quote in writing before any repair is performed. The price on the quote is the price on the invoice. No estimates that expand once access panels are opened, no surprise parts charges after approval.
AIRONE offers same-day heat pump repair in most areas across Los Angeles County, South Bay, and Orange County. Service is available Monday through Saturday 7:00 AM to 7:00 PM with 24/7 emergency dispatch. Heat pump failures that leave you without both heating and cooling are treated as priority dispatches. Call (323) 471-1037 to check same-day availability.
AIRONE holds CA Contractor License #114807 (C-20) and EPA 608 refrigerant handling certification. The C-20 classification is the California contractor license required for HVAC work including heat pump repair. EPA 608 is required for all refrigerant handling. Both credentials are required for compliant heat pump service in California. Verify at cslb.ca.gov.
AIRONE serves Los Angeles County, South Bay, and Orange County. Google reviews coming soon — call (323) 471‑1037 to speak with a customer directly.
When repair is no longer cost-effective, AIRONE installs new AHRI-matched heat pump systems. IRA §25C federal tax credit up to $2,000. TECH Clean California rebates up to $3,000. Permit included, same-week installation available.
View Heat Pump Installation →
AIRONE diagnoses and repairs all central AC systems. Same-day service in most areas. $89 diagnostic applied toward repair. Flat-rate pricing on all central AC brands and configurations.
View AC Repair →
Ductless mini-split heat pump repair including reversing valve, defrost system, refrigerant faults, and error code diagnosis. Same diagnostic standard as ducted heat pump repair. $89 diagnostic applied toward repair.
View Mini-Split Repair →
Compressor failure or major coil damage on a heat pump over 10 years old? AIRONE provides replacement cost at every diagnostic visit. IRA §25C credit up to $2,000 on qualifying replacement systems.
Annual heat pump maintenance prevents the reversing valve, defrost, and refrigerant failures that lead to repair calls. AIRONE maintenance visits include full system inspection in both heating and cooling modes.
View AC Maintenance →
Heat pump failed without warning? AIRONE provides 24/7 emergency dispatch across LA County, South Bay, and Orange County. Heat pump emergencies handled same day by EPA 608 certified technicians.
View Emergency HVAC →