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Trane · Furnace troubleshooting

Venting system check before placing an appliance back in service

UH1DH1

What is going on

Used when other gas appliances share the venting system. Test each appliance one at a time while the others are off.

Check in this order

  1. Seal any unused openings in the venting system.
  2. Check venting for correct size, horizontal pitch, blockage, restriction, leakage, corrosion and other faults that could cause an unsafe condition.
  3. Close building doors and windows and doors between the appliance space and the rest of the building.
  4. Close fireplace dampers.
  5. Start clothes dryers and any appliance not on the venting system. Run exhaust fans such as range hoods and bathroom fans at maximum speed. Do not run a summer exhaust fan.
  6. Light the appliance per its lighting instructions and set the thermostat so it runs continuously.
  7. Check that the appliance vents properly. If it does not, correct the venting per the National Fuel Gas Code and CAN/CGA B149.1.
  8. After testing, return doors, windows, fans, dampers and other gas appliances to their original condition.

Applies to: All furnaces on a shared venting system

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Source: Trane AUH1B080A9421B installer's manual, p. 1-6 (Safety section, p. 6). Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.