Lennox HVAC Repair
- Lennox system not cooling or heating
- Fault codes on the control board
- iComfort thermostat not responding
- Weak or uneven airflow
- Compressor won't engage
- Water pooling around the unit
- Frozen evaporator coil
- Loud clicking, buzzing, or humming
- Short cycling on and off
- Sudden spike in energy bills
- Clogged or dirty filters
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Common Lennox HVAC Problems We Deal With
- No heat or cool output
- Fault codes on the board
- Weak or restricted airflow
- Compressor won't engage
- Water leaking or pooling
- Frozen evaporator coil
- iComfort not communicating
- Loud or unusual noises
- System won't start
- Short cycling
- High energy bills
- Poor indoor air quality
No Heat or Cool Output
When a Lennox system stops producing warm or cool air, the cause is usually tied to a failed igniter or heat exchanger, low refrigerant, a bad capacitor, a clogged filter, or a variable-capacity compressor that's no longer cycling correctly. Lennox's Signature and Elite series units often flag the issue with a diagnostic code before the symptom becomes obvious, so an early inspection can save you from a bigger repair.
Our technicians work on the full Lennox lineup, from Merit series to Signature and Elite variable-capacity systems, and diagnose heating and cooling problems quickly. We'll get your Lennox system back to full performance in every season.
Fault Codes on the Board
Lennox control boards log fault codes through an LED sequence or diagnostic display, and misreading them can lead to the wrong part being replaced. Common triggers include a pressure switch fault, flame sensor issue, limit switch trip, or a communication error between the board and thermostat.
Our technicians know how to pull and interpret Lennox's diagnostic codes and trace them back to the actual failing component, so you're not paying for guesswork.
Weak or Restricted Airflow
Reduced airflow from a Lennox system usually points to a dirty filter, blocked return, a failing variable-speed blower motor, or ductwork issues. Lennox's variable-capacity models are especially sensitive to restricted airflow, which can trigger extra wear or even shut the system down as a safety measure.
We'll inspect the blower, ducts, and filter housing, then restore proper airflow so your Lennox system runs the way it was designed to.
Compressor Won't Engage
If the outdoor unit hums but the compressor never kicks in, common causes include a failed start/run capacitor, a tripped internal overload, low refrigerant, or a bad contactor. On Lennox units, a compressor that repeatedly fails to start can quickly overheat and cause further damage if left alone.
We'll test the electrical components first, since that's often the fastest and most affordable fix, and move on to deeper diagnostics only if needed.
Water Leaking or Pooling
Water around your Lennox indoor unit is typically caused by a clogged condensate line, a cracked drain pan, a frozen coil that's now thawing, or a condensate pump that's stopped working. Left unresolved, this can damage flooring, drywall, and ceilings.
Our technicians will clear the drain line, repair or replace the failed part, and confirm the system drains properly before we leave.
Frozen Evaporator Coil
A frozen coil on a Lennox system almost always traces back to restricted airflow, a dirty filter, a refrigerant leak, or a failing blower motor. Running the system while the coil is frozen can push liquid refrigerant back into the compressor and cause serious damage.
We'll shut the system down safely, let it thaw if needed, identify the root cause, and repair it so the coil doesn't freeze again.
iComfort Not Communicating
Lennox's iComfort system relies on constant communication between the thermostat and the equipment, so a wiring fault, a firmware glitch, or a failed control board can cause lost connections, incorrect readings, or a system that ignores commands entirely.
We'll test the communication wiring, check the control board, and reset or recalibrate the thermostat so it's talking to your Lennox equipment the way it should.
Loud or Unusual Noises
Clicking on startup is normal, but grinding, screeching, banging, or a persistent buzzing from your Lennox unit usually means a part is loose, worn, or failing. This can involve the blower wheel, fan motor, compressor mounts, or ductwork.
We'll track down exactly where the noise is coming from and repair or replace the part before it turns into a bigger mechanical failure.
System Won't Start
If your Lennox system won't power on at all, check first for a tripped breaker or blown fuse — but the deeper cause is often a failed transformer, a bad thermostat, a safety switch that's stuck open, or a control board fault.
We run a full electrical and safety-circuit diagnostic on Lennox equipment to find the actual cause and get your system started again without unnecessary part swaps.
