HVAC repair in Aurora, CO covers problems that hit the whole heating and cooling system, not one appliance: a system where neither heat nor AC will come on, short cycling, a thermostat that does not control the equipment, blown fuses, and airflow problems that affect both seasons.
The furnace and the air conditioner in most Aurora homes share the same blower, control board, thermostat wiring and ductwork. A fault in any of those shared parts can take out heating and cooling at once. For single-appliance problems see furnace repair in Aurora and AC repair in Aurora.
Heating and Cooling Not Coming On
- Blown 3 or 5 amp fuses on the furnace control board, often from a shorted thermostat wire
- Failed 24 volt transformers
- Thermostat wiring broken in the wall or chewed at the outdoor unit
- Condensate float switches that cut power when a drain backs up
- Furnace door safety switches and furnace power switches
- Control boards that no longer respond to the thermostat
Furnace and AC Short Cycling Repair
Short cycling means the system starts and stops again and again without finishing a full cycle. On the furnace side the usual causes are a dirty flame sensor, an overheating furnace tripping its limit switch, or a pressure switch opening. On the cooling side it is often a frozen coil or a compressor overheating. A thermostat mounted near a supply register or in direct sun can also cut cycles short. Equipment that is too large for the house will short cycle in mild weather.
Airflow and Duct Problems
Low airflow causes trouble in both seasons: an overheating furnace in winter and a frozen coil in summer. Dirty filters, collapsed flex duct, disconnected runs in a crawlspace or attic, closed dampers and undersized returns are the common causes. Many 1970s houses in Meadowood and Mission Viejo still have their original return paths, which were sized for older furnaces with smaller blowers.
Thermostats and Controls
Thermostat repair covers dead displays, thermostats that read the wrong temperature, wiring faults, and smart thermostats that lost power because they need a common wire the old wiring does not have. Heat pump thermostats need the right reversing valve and backup heat settings or the system will heat and cool at the wrong times.
HVAC repair covers Heather Ridge, east Centennial plus the rest of the Aurora service area.
Sources and local offices: Meadowood census tract data, Arapahoe County, Colorado.
Questions About HVAC Repair
Why is my AC and heat not kicking on?
When neither heating nor cooling works, look at what they share: power to the furnace, the furnace switch, the control board fuse, the transformer, the thermostat and its wiring, and the condensate float switch. A backed-up drain line is a common cause in summer.
How can I tell if a furnace fuse is blown?
The small automotive-style fuse on the control board will have a broken strip inside, and the thermostat may go blank. A fuse that blows again after replacement means a wire is shorting somewhere, often at the thermostat or the outdoor unit.
What is considered short cycling for a furnace?
Running for only a few minutes, shutting off, and starting again soon after, many times an hour, without the house reaching the thermostat setting.
What is the most common cause of short cycling?
On furnaces, a dirty flame sensor or overheating from a clogged filter or blocked return. On air conditioners, a frozen coil or a compressor tripping on heat. Oversized equipment is another common cause.
Can a bad thermostat cause short cycling?
Yes. A thermostat with a failing sensor, loose wiring or a poor location near a supply vent or a sunny window can shut the system off before it finishes a cycle.
What are the first signs of a bad thermostat?
A blank or flickering display, a reading that does not match the room, a system that does not start when the setting changes, and a system that keeps running after it reaches the set temperature.
How do I fix my furnace short cycling?
Start with a new filter and open vents and returns. If it still short cycles, the flame sensor, limit switch, pressure switch, vent pipes and thermostat location need to be checked.
What are the most expensive HVAC repairs?
Compressor replacement on the AC or heat pump, a furnace heat exchanger, an evaporator coil, and variable speed blower motors and their control modules.
How old is a good age for HVAC in a house?
Condition matters more than age. Equipment that has been maintained, sized right and never run with clogged filters lasts longer. Repair history and parts availability are better guides than the date on the label.