Gas Heat Pump Not Working (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

First, confirm the thermostat is set correctly and the power is on. Check for gas supply issues and ensure the emergency shutoff valve is open. If the problem persists, contact a licensed HVAC technician.

Confirm the symptom

No heat output from the heat pump
Heat pump won't start or turn on
Thermostat shows no response
Pilot light is out or won't stay lit
Gas smell but no operation

Tools and prep

Thermostat
Screwdriver (if needed for access panels)
Gas leak detector or soapy water
Flashlight
Owner's manual for the heat pump
Safety goggles
Work gloves

Step-by-step troubleshooting

Check Thermostat Settings
Do: Ensure the thermostat is set to 'Heat' and the desired temperature is higher than the room temperature.
Observe: Thermostat does not activate the heat pump.
Means: Thermostat may be faulty or improperly configured.
Next: Check power supply to the thermostat.
Verify Power Supply
Do: Check the circuit breaker or fuse box for the heat pump. Reset any tripped breakers.
Observe: Breaker is tripped or fuse is blown.
Means: Electrical issue preventing operation.
Next: Check for gas supply and shutoff valve.
Check Gas Supply
Do: Ensure the gas shutoff valve is fully open and there is no gas leak.
Observe: Gas valve is closed or there is a gas leak.
Means: No gas reaching the heat pump.
Next: Inspect pilot light or ignition system.
Inspect Pilot Light or Ignition System
Do: Look at the pilot light (if applicable) or ignition system for any signs of malfunction.
Observe: Pilot light is out or ignition system fails to ignite.
Means: Ignition system failure or gas flow issue.
Next: Check for error codes or indicator lights.
Check for Error Codes
Do: Look for any error codes or indicator lights on the heat pump control panel.
Observe: Error code is displayed or indicator light is blinking.
Means: Internal system error or component failure.
Next: Consult owner's manual for error code interpretation.
Consult Owner's Manual
Do: Refer to the owner's manual for specific troubleshooting steps related to the error code.
Observe: Manual provides no resolution or unclear instructions.
Means: Professional diagnosis may be required.
Next: Contact a licensed HVAC technician.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Thermostat Malfunction Incorrect settings or faulty wiring prevent the system from receiving a heat demand signal.	Common	Easy	Thermostat replacement or repair
Tripped Circuit Breaker Electrical overload or short circuit trips the breaker, cutting power to the heat pump.	Common	Easy	Reset breaker or replace fuse
Closed Gas Shutoff Valve The gas supply is manually turned off, preventing fuel from reaching the burner.	Sometimes	Easy	Gas valve repair or replacement
Gas Leak A leak in the gas line or connections reduces or cuts off gas supply.	Rare	Hard	Gas line repair or replacement
Faulty Ignition System The pilot light or electronic ignition fails to ignite the burner.	Sometimes	Medium	Ignition system repair or replacement
Internal System Error Error codes indicate a malfunction in the heat pump's internal components.	Sometimes	Hard	Professional diagnosis and repair

Parts matching

If your gas heat pump needs parts, match these common issues to the right components:

Thermostat replacement for incorrect settings or failure
Gas valve repair or replacement for closed or leaking valves
Ignition system components for pilot light or electronic ignition failure
Gas line repair for leaks or blockages
Control board or sensor replacement for error codes

Always consult a licensed HVAC technician for gas-related repairs to ensure safety and compliance with local codes.

When to call a professional

You detect a gas leak or smell gas indoors
The pilot light won't stay lit after multiple attempts
Error codes persist after checking all basic issues
The heat pump makes unusual noises or smells
You're unsure about gas line or electrical repairs
The system is over 10 years old and requires frequent repairs

FAQ

Why won't my gas heat pump start?

Check the thermostat settings, power supply, and gas valve. A tripped breaker or closed gas valve can prevent operation.

How do I know if there's a gas leak?

Use a gas leak detector or soapy water on gas line connections. Bubbles indicate a leak. Do not attempt to fix gas leaks yourself.

What should I do if the pilot light won't stay lit?

Ensure the gas valve is fully open. If the pilot light still won't stay lit, contact a professional HVAC technician.

Can I reset my gas heat pump?

Yes, you can reset it by turning off the power at the circuit breaker for 30 seconds, then turning it back on. Check the owner's manual for specific reset instructions.

Why is my gas heat pump making strange noises?

Unusual noises may indicate a problem with the blower motor, gas valve, or internal components. Contact a professional for diagnosis and repair.