Search Heco's growing HVAC knowledge library for repair symptoms, maintenance, parts, heat pumps, replacement planning, permits, rebates, commercial systems and more.
Heco HVAC · Experience since 2006 · California contractor license #1050351
Detailed homeowner guides explain safe checks, possible causes and when to request professional diagnosis.
Search what you observe—not what you think the failed part is. Several HVAC faults can produce the same symptom, and an on-site diagnosis is often needed before choosing a repair.
9 matching answers
Clear filtersCheck normal thermostat settings: Heat mode, a setpoint above room temperature and Fan Auto. With equipment off, inspect only a safely accessible filter according to the equipment instructions, and keep grilles clear. Cold air can have several causes; persistent loss of heat needs Heco diagnosis. Leave panels, burners and wiring alone.
Short cycling can involve restricted airflow, thermostat/control problems, overheating or other faults. With equipment off, inspect only an accessible filter as instructed and keep grilles clear. Do not keep restarting the furnace. Heco can diagnose repeated cycling and explain repair options after testing.
Fan On can circulate air between heating cycles, so check whether the thermostat is set to Fan Auto. Continuous cold airflow can also involve a failed heating sequence, control fault or airflow problem. It does not identify a failed part. If changing normal settings does not resolve it, request Heco diagnosis.
A pilot that repeatedly goes out needs professional diagnosis; causes can involve the pilot safety system, gas supply, drafts or venting. Do not repeatedly relight it or adjust gas controls. Heco can evaluate compatible gas/propane wall furnaces. If you smell gas, leave and call the gas utility or emergency services from a safe location.
No. Do not bypass a furnace pressure switch or any safety control. It may be stopping operation because an unsafe draft, venting or other condition exists. Leave the system off and request professional diagnosis rather than forcing it to heat.
Yes. Heco offers propane wall-furnace repair. Note the city, model if known and what happens when heat is requested; tell the technician about any recent empty tank or fuel delivery. Do not adjust regulators or gas valves. For gas odor or a CO alarm, leave and get emergency help from safety.
A bang at startup can involve delayed ignition or other mechanical/duct issues. Stop using the furnace and arrange professional inspection before restarting it; do not open burner panels or attempt repeated starts. If there is gas odor, smoke, fire or a CO alarm, leave and contact emergency services from safety.
Leave flame-sensor removal and cleaning to a qualified technician. It requires access to internal furnace components and is not a normal homeowner check in Ask Heco guidance. Do not open the burner compartment, sand components or bypass controls. Heco can test the ignition/flame-sensing sequence and diagnose why the furnace stops.
A confirmed cracked heat exchanger requires the furnace to be taken out of service until a qualified technician determines a safe solution. Depending on the model, condition, parts availability and warranty, replacement of the heat exchanger or the furnace may be considered. Heco must inspect it; neither a photo nor chat can establish safe operation.
Equipment condition still requires professional evaluation. For regulations, rebates and efficiency guidance, Heco checks authoritative sources and identifies items that can change.
Tell Heco the symptom, equipment type, property type and location. We will help identify the next practical step.