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DIY Guides for Troubleshooting HVAC Issues

Is your HVAC system not working quite right? Before calling for a service appointment, you may want to do a quick check for some common HVAC problems. Tyler Heating, Air Conditioning, Refrigeration LLC offers free checklists below to help you with troubleshooting HVAC problems. If you need further assistance, feel free to call us today at (203) 378-4700 or submit the online form and we will get back to you ASAP.

  • Check the settings on your thermostat. Make sure the temperature control selector is set below the current room temperature, and the system switch is on the COOL or AUTO position. The fan switch should be set to ON for continuous airflow or AUTO if you want the blower to operate only while the air conditioner is operating.
  • Try to get the air conditioner to turn on by lowering the thermostat to its lowest temperature setting.
  • If the air flow out of your registers seems low, check the air filter. An extremely dirty air filter can block air flow.
  • Make sure all registers are open and not obstructed.
  • Check the power disconnect switch by each unit (outdoor and indoor).
  • Check the fuse/breaker at the electrical panel for both the outdoor and indoor unit.

Still have a problem? Call (203) 378-4700 Schedule Service

  • Check the settings on your thermostat. Make sure the temperature control selector is set above the current room temperature, and the system switch is on the HEAT or AUTO position. The fan switch should be set to ON for continuous airflow or AUTO if you want the blower to operate only while the heat pump is operating.
  • Try to get the heat pump to turn on by raising the thermostat to its highest temperature setting.
  • If the air flow out of your registers seems low, check the air filter. An extremely dirty air filter can block air flow.
  • Make sure all registers are open and not obstructed.
  • Check the power disconnect switch by each unit (outdoor and indoor).
  • Check the power disconnect switch by each unit (outdoor and indoor).
  • Check the fuse/breaker at the electrical panel for both the outdoor and indoor unit.

Still have a problem? Call (203) 378-4700 Schedule Service

  • Check the settings on your thermostat. Make sure the temperature control selector is set above the current room temperature, and the system switch is on the HEAT or AUTO position. The fan switch should be set to ON for continuous airflow or AUTO if you want the blower to operate only while the furnace is operating.
  • Try to get the furnace to turn on by raising the thermostat to its highest temperature setting.
  • If the air flow out of your registers seems low, check the air filter. An extremely dirty air filter can block air flow.
  • Make sure all registers are open and not obstructed.
  • Check the power disconnect switch by the furnace.
  • Check the fuse/breaker at the electrical panel for the furnace.
  • Check to make sure the gas control valve to the furnace is open.
  • Check the pilot light. (Electronic ignitions will not have a pilot light).

Still have a problem? Call (203) 378-4700 Schedule Service

  • Check the settings on your thermostat. Make sure the temperature control selector is set above the current room temperature, and the system switch is on the HEAT or AUTO position. The fan switch should be set to ON for continuous airflow or AUTO if you want the blower to operate only while the furnace is operating.
  • Try to get the furnace to turn on by raising the thermostat to its highest temperature setting.
  • If the air flow out of your registers seems low, check the air filter. An extremely dirty air filter can block air flow.
  • Make sure all registers are open and not obstructed.
  • Check the power disconnect switch by the furnace.
  • Check the fuse/breaker at the electrical panel for the furnace.
  • Check to make sure you have fuel oil.

Still have a problem? Call (203) 378-4700 Schedule Service

  • Check the settings on your thermostat. Make sure the temperature control selector is set above the current room temperature, and the system switch is on the HEAT or AUTO position.
  • Try to get the boiler to turn on by raising the thermostat to its highest temperature setting.
  • Check the power disconnect switch by the boiler.
  • Check the fuse/breaker at the electrical panel for the boiler.
  • Check to make sure you have fuel oil or check to make sure the gas control valve to the boiler is open.
  • Check the pilot light. (Electronic ignitions will not have a pilot light).

Still have a problem? Call (203) 378-4700 Schedule Service

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Our Reviews See What Your Neighbors Are Saying

Such a pleasure to deal with everyone at Tyler. All our AC lines needed to be replaced. The crew Tyler sent out was terrific! They arrived right on time and communicated with us throughout the entire process. Their work was neat and meticulous and they were…

Such a pleasure to deal with everyone at Tyler. All our AC lines needed to be replaced. The crew Tyler sent out was terrific! They arrived right on time and communicated with us throughout the entire process. Their work was neat and meticulous and they were…

St K.

St K.

I have been using Tyler for all of my central air, heating (gas furnace) and water heater needs for several years now. They have NEVER disappointed me, the technicians are always polite and honest and I've never considered using anyone else.

I have been using Tyler for all of my central air, heating (gas furnace) and water heater needs for several years now. They have NEVER disappointed me, the technicians are always polite and honest and I've never considered using anyone else.

Seth O.

Seth O.

Tyler was amazing. They worked with me on Christmas night when my heat went out and were back the next day to put in a new boiler and water tank. Their service was really great. I would highly recommend them!!! I just had them back to…

Tyler was amazing. They worked with me on Christmas night when my heat went out and were back the next day to put in a new boiler and water tank. Their service was really great. I would highly recommend them!!! I just had them back to…

Tim C.

Tim C.

Great experience. I woke up on a cold January Monday morning with the long overdue death of an ancient furnace and by that afternoon, I had a plan. The great team at Tyler came out the next morning at 7:30 a.m., and I had my heat…

Great experience. I woke up on a cold January Monday morning with the long overdue death of an ancient furnace and by that afternoon, I had a plan. The great team at Tyler came out the next morning at 7:30 a.m., and I had my heat…

Valerie K.

Valerie K.

From the inside staff to the techs on the job, my experience with Tyler was efficient and seamless. Customer Service and Communication are simply outstanding. Thank You!!

From the inside staff to the techs on the job, my experience with Tyler was efficient and seamless. Customer Service and Communication are simply outstanding. Thank You!!

Robert M.

Robert M.