Lennox Error Code F5: Discharge temperature sensor open/ short circuited
Lennox – Error Code F5
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Lennox – Error Code F5
Is your Lennox air conditioner showing up with Error Code F5 on the screen?
What is a Lennox Error Code F5?
Discharge temperature sensor open/ short circuited
Recommended solution/fix steps
Contact air conditioner technician.
Troubleshooting to try
- Check for a dirty air filter
- Check your thermostat settings
- Check your air conditioner circuit breakers
- Check your outdoor unit
- Check all air vents
How to restart/reset/reboot your Lennox air conditioner?
You may find your Lennox air conditioning unit needs resetting if it starts to malfunction or isn’t responding to any input via your control panel or remote control. Resetting your air conditioner re-starts the internal computer and can often restore the unit to normal working order. The exact instructions will vary depending on your model of Lennox air conditioner.
Typically, this procedure will be:
- Turn off the air conditioning unit on your thermostat
- Next, locate your circuit breaker and find the breaker that controls your Lennox air conditioner
- Now, reset the breaker
- Wait a minimum of 30 seconds before turning the breaker back on
- Turn your air conditioning on using the thermostat
Lennox Maintenance
During normal air conditioner operation, dust, dirt, moisture from humidity or condensation, and microbial growths can build up on internal components. Left unchecked, these issues can corrode components like the evaporator coil and condenser coil. Over time, those components can become less effective and lead to a loss of efficiency or worse, a shorter air conditioner lifespan.
Regular AC maintenance and tune-ups can minimize many of the issues caused by a build-up of dirt and debris. If they are performed by an HVAC technician, these inspections allow your contractor to check for longer-term issues and in some cases take proactive steps to prevent premature failure or inconvenient breakdowns during the cooling season.
Annual air conditioner preventative maintenance may also be a requirement to keep your warranty valid as well. Many manufacturers state on warranty documentation that installation and maintenance by a licensed HVAC service provider are a part of the warranty conditions.
Cleaning your Lennox Air Conditioner
One simple way to potentially save money and prolong the life of an AC system is to make sure the outdoor unit stays clean. During normal operation, a fan in the outdoor unit pulls air through the condenser coil. Airborne dust and dirt particles and debris from nearby foliage can get lodged in the coil fins, restricting airflow and affecting performance.
Change or clean the air filters
The most important maintenance task that will improve the efficiency of your air conditioner is to routinely replace or clean the air filters. Replace one-inch pleated filters once a month. If you’re unsure of the type of filter to use, your Lennox Dealer can recommend one based on your specific system. For all other filter sizes, your Lennox Dealer will check, clean, or replace them at your annual maintenance visit. Remember, filters may need more frequent attention if your air conditioner is in constant use, is subject to dusty conditions, or you have pets in the house.
Clean the air conditioner’s coils
The air conditioner’s evaporator and condenser coils collect dirt over time. This dirt reduces airflow and insulates the coil, reducing its ability to absorb heat. Outdoor condenser coils can also become very dirty if the outdoor environment is dusty or if there is foliage nearby. To avoid these problems, your Lennox Dealer will check and clean your air conditioner’s coils, if necessary, at your annual maintenance visit.
Remove debris from the unit
Over time, things like leaves, dirt and grass clippings will build up on the outside of your air conditioner, decreasing system capacity and reducing airflow. You should trim any shrubs or other plants back from around the air conditioner to keep from impeding airflow to and from the unit.
Straighten coil fins
The aluminium fins on evaporator and condenser coils are easily bent and can block airflow through the coil. Your Lennox Dealer will check these pieces at your annual maintenance visit and straighten them, if necessary.
