Heat Pump Problems in Oklahoma: Common Issues

I’m Dave Hartzell. 45 years on tools, Master HVAC license, Kingfisher OK. Heat pumps have come a long way in Oklahoma, but they still hit the same handful of issues when the weather turns. I’ll cover what I see most: defrost cycle failures, reversing valve sticks, low refrigerant, blown capacitors, frozen outdoor coils, and the supplemental heat strip that won’t kick in. 4.8 stars / 279 reviews.

If your heat pump isn’t heating or cooling in Oklahoma, the most common causes are a dirty filter, tripped breaker, low refrigerant, failed defrost board, or a stuck reversing valve. Most heat pump problems in central Oklahoma come down to one of these five issues. Hartzell’s Heat & Air diagnoses heat pumps across Kingfisher and surrounding counties for a $111 diagnostic fee, credited toward the repair. Call 405-375-4822 any time.

One I diagnosed in Dover last December: Customer’s heat pump kept going into defrost every 30 minutes during a 22 degree cold snap. Auxiliary heat strips were running constantly. Electric bill was tracking $400 over normal. Found a stuck reversing valve solenoid, not a refrigerant issue. $387 part and labor, system went back to normal cycle within an hour. Heat pumps in Oklahoma struggle below freezing if any component is off, sometimes it’s not the obvious thing.

5 Most Common Heat Pump Problems in Oklahoma

Oklahoma weather is tough on heat pumps, 100-degree summers, ice storms, and wide temperature swings all stress the equipment. Here are the failures I see most often:

• Frozen outdoor unit. When the outdoor coil ices over in winter, the defrost cycle should handle it automatically. If the unit stays frozen, the defrost board, defrost thermostat, or reversing valve may have failed.
• Heat pump blowing cold air in heat mode. Usually a refrigerant leak, a stuck reversing valve, or backup electric strips failing to energize when outdoor temps drop below the heat pump’s threshold.
• Unit runs but doesn’t heat or cool effectively. Low refrigerant is the most common culprit. A refrigerant leak must be found and fixed, not just recharged.
• Heat pump short cycles (turns on and off rapidly). Often oversized equipment, a refrigerant issue, a failing capacitor, or a dirty coil restricting airflow.
• Heat pump won’t start at all. Check the breaker and thermostat batteries first. If those are fine, a failed capacitor, contactor, or control board is usually the issue.

What to Check Before Calling a Technician

A few checks you can do yourself before scheduling a service call:

• Check the air filter, a clogged filter causes more heat pump failures than almost anything else.
• Check the breaker panel. Heat pumps have two breakers: one for the outdoor unit and one for the air handler. Both must be on.
• Check thermostat batteries and settings. Make sure it’s set to HEAT or COOL, not EMERGENCY HEAT.
• Check that the outdoor unit isn’t buried in ice, debris, or vegetation.

If all of those look fine and the system still isn’t working, it’s time for a professional diagnosis. A licensed tech can check refrigerant charge, electrical components, and controls in about an hour.

What Hartzell’s Does on a Heat Pump Service Call

I run through a full diagnostic, refrigerant pressures, electrical readings, defrost cycle operation, reversing valve function, and airflow. The $111 diagnostic fee is credited toward the repair if you approve the work. A $99 dispatch fee also applies to every call.

If the heat pump is beyond repair, or the repair cost approaches the cost of a new system, we’ll tell you honestly. Dave Hartzell has replaced and serviced heat pumps in central Oklahoma for 15+ years. Hartzell’s carries parts for Trane, Mitsubishi, and other major brands on our trucks.

Frequently Asked Questions