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Quick And Easy Tips For Troubleshooting A Lennox Heat Pump

Quick And Easy Tips For Troubleshooting A Lennox Heat Pump

Lennox is a name synonymous with high-quality heat pumps and energy efficiency. However, even the most dependable heating systems can fail. If your heat pump isn’t working properly and you’re looking for a solution, look no further. We did some research, and this is what we discovered.

The following are the most common issues with Lennox heat pumps:

  • Components that have been frozen
  • Low heating and cooling
  • Leaks of water and refrigerant
  • Heating and cooling are not working.
  • The unit will not turn on.

Some of these issues are minor, and you can solve them on your own. However, more complex issues will necessitate the assistance of a heat pump specialist. Continue reading to learn more about each problem and its solutions.

Common Issues With Lennox Heat Pumps

Quick And Easy Tips For Troubleshooting A Lennox Heat Pump

A heat pump is an all-in-one system that serves as an air conditioner during the summer and a heater during the winter. It uses less energy than a furnace or boiler and is the best option for use during the winter.

Despite the higher cost, many people prefer a heat pump to a furnace for heating their homes. It is a wise long-term investment because it saves energy and money by using electricity instead of gas.

However, due to technical and environmental factors, the efficiency of heat pumps can degrade over time. What should you do first if you have a heat pump problem?

The following are the most common causes of heat pump problems and what you can do to restore its efficiency.

1. Components That Have Been Frozen

A frozen heat pump can indicate one of two things. The first is moisture buildup in the evaporator coils, and the second is an ice layer covering the outer unit. Heat pumps enter defrost mode automatically to prevent components from freezing.

During defrost mode, the heat pump draws warm air indoors and pumps it out, passing it through the condenser coils to melt the ice. The defrost cycle will last between five and fifteen minutes at predetermined intervals.

What Should You Do?
A thick layer of ice covering the outdoor unit will prevent airflow and prevent the system from properly defrosting. Here’s what you should do:

In the case of frozen outdoor units:

Quick And Easy Tips For Troubleshooting A Lennox Heat Pump
  • To help melt the ice, spray it with water from a hose. To avoid damaging the unit, avoid chipping off the ice.
  • Is it safe to pour hot water on a frozen heat pump? You certainly can. If the ice is too thick, carefully pour hot or warm water, only enough to help melt the ice faster.

Internal components that have been frozen:

  • To improve airflow, remove the ice that is blocking the outer unit (see above instructions).
  • To improve air circulation, clean dirty filters and evaporator coils.

Newer Lennox heat pump cabinets are made of galvanized steel with a special PermaGuard coating for longer-lasting corrosion protection. To prolong the durability of the ice, it is still prudent to remove it as soon as it is visible.

Defective outdoor fans, low refrigerants, and water leaks can also cause a heat pump to freeze. If this is the case, contact Lennox customer service to have the unit repaired.

2. Low Heating/Cooling

Proper air circulation in a home is essential because it regulates temperature and keeps the indoor air mold-free. The same can be said for the heat pump’s internal systems. It requires continuous airflow to operate efficiently and avoid freezing, heating, and cooling issues.

If you notice a decrease in heat or cooling distribution indoors, this is a sign of insufficient airflow, which is most likely caused by a clogged air filter.

What Should You Do?
Replace filters as needed and clean them on a regular basis. Air filters are available from your local Lennox dealer. An obstruction in the outdoor unit is another source of insufficient airflow. Clean out any fallen leaves, grass clippings, shrubs, or outdoor debris that has accumulated around the unit on a regular basis.

3. Leaks Of Water And Refrigerant

Quick And Easy Tips For Troubleshooting A Lennox Heat Pump

Water stains on walls, mold growing on walls, and water pooling near the heat pump are all signs of a leak. Water leaks are most likely the cause of a clogged drain line, a damaged drain pan, or a faulty check valve.

Furthermore, standing water inside the unit can cause component and electrical damage.

It is critical to determine whether the leak is caused by excessive moisture or by a refrigerant leak. It is difficult to detect a refrigerant leak. A greasy film on the water, a faint hissing sound, or a noticeable reduction in heating and cooling performance are all common symptoms.

What Should You Do?

In the case of refrigerant leaks:

  • Turn off the heat pump’s main power source and inspect any potential leak areas.
  • Contact a technician to repair the leak or replace broken components, as well as to refill the refrigerant.

In the event of a water leak:

  • Locate the drain pan and use a dry cloth to remove any standing water. Damage to the pan necessitates the services of a technician for replacement.
  • Locate the drain line and clear any debris that may be clogging it.
  • In the case of faulty check valves, a technician should be able to determine whether there is a leak in the pipes or valves.

4. Heating And Cooling Are Not Working

We previously discussed heat pumps with poor heating and cooling performance. But what if the heat pump is on but not producing any heat or cool air?

Possible causes of heat pump cooling/heating failure include:

  • Thermostat failure
  • Incorrect thermostat configuration
  • Low refrigerant levels
  • The outdoor unit is obstructed.
  • Faulty reverse valve

What Should You Do?

  • Incorrect thermostat setting – Make sure the thermostat is set to the desired temperature, whether in cooling or heating mode.
  • Low refrigerant – Having too much or too little refrigerant can significantly reduce the efficiency of the heat pump. As a result, having this checked by a technician is critical, especially if you suspect a leak.
  • Faulty reverse valve – If the unit is cooling but not heating, or vice versa, the reverse valve may be stuck or damaged. If it’s stuck, a light tap on the body should do the trick, but if there’s a mechanical issue, it’s time to call a technician.

5. The Unit Will Not Turn On

It’s inconvenient when the heat pump won’t turn on or doesn’t appear to have power. Possible causes include a faulty thermostat, a power outage, or a faulty starter capacitor.

What should I do?

  • Faulty thermostat – Make sure the thermostat is getting power by replacing the battery (if it runs on batteries) or checking the electrical panel if a fuse or circuit breaker has blown.
  • Power outage – Make sure both the indoor and outdoor units are turned on. Check the electrical panels and circuit breakers if the units are turned on.
  • Faulty starter capacitor – If you hear a faint clicking sound when you turn on the unit but it does not power on, you may have a faulty starter capacitor.

Checklist For Pre-Service

If none of the above troubleshooting tips work, it could be a sign of a more serious issue, and it’s time to contact Lennox customer service. Here’s a checklist to help you avoid paying for unnecessary services:

  • Make certain that the electrical disconnect switches are turned on.
  • Check that the room thermostat selector is set correctly.
  • Check to see if the room thermostat system switch is set correctly.
  • The access panels must be installed.
  • The filters in the unit are clean.

Check to see if the heat pump is still under warranty. Also, before contacting customer service, make sure you have the unit model number.

How Do I Get in Touch With Lennox Customer Service?

You can contact your local Lennox dealer by going to their official website and selecting ‘homeowner solutions,’ then scrolling down to the ‘Find a dealer’ section. Enter your zip code, and the page will redirect you to a list of local dealers.


It is difficult to diagnose heat pump problems. Also, keep in mind that this device retains electrical charges even when disconnected from a power source. It’s best to avoid attempting to repair it if you don’t understand basic electrical safety.

Quick And Easy Tips For Troubleshooting A Lennox Heat Pump

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Written by HVAC Contributor

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