Diagnostics Checklist

Hot Water Tank

  • Record the model and serial number
  • Record any error messages
  • Is anything leaking?
  • Is the pilot light on?
  • Are there any unusual noises?

Furnaces, Boilers, Make Up Units

  • Record the model and serial number
  • Is anything leaking?
  • Are there any unusal smells?
  • Is the pilot light on?
  • Are there any unusual noises?
  • Is there any flame rollout (carbon deposit can buildup over time)

General Heating

  • Are any radiators cold or hot?
  • Does the thermostat work?
  • Is the zone valve working?
  • Is anything leaking?
  • Are there any unusual noises?




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