Stop first if
- A gas smell or CO alarm comes up during the visitStop work and leave. From outside, call emergency services or the gas utility.
01
Ask on the call
6Homeowner? These are the questions a good technician will ask you. Having the answers ready makes the first visit count.
- Is the concern bills, comfort or both?
- How old is the equipment, and does a pilot stay lit all year?
- Has insulation, window or air sealing work been done since it was sized?
- Which part keeps breaking, and what did the last tech find?
- Are run times short?
- Do you have service records?
02
Bring
5- Clamp-on current meter
- Combustion test instruments
- Probe thermometers
- Tape measure
- Flashlight
03
Check on site
6- Record appliance type, venting, ignition, burner, install date and models.
- Note the cycle pattern and any standing pilot.
- Inspect both coils. Compare with the unit's own baseline at similar conditions.
- On a repeat part, name why the last one quit before replacing it.
- For replacement, run a current load calculation plus a second method. Do not copy the old nameplate.
- Match indoor and outdoor units by exact model from maker's data.
04
Keep on the record
5- Nameplate photos
- Combustion printout, before and after
- Cycle notes
- Part replacement history
- Load calculation
General guidance for a qualified person, not a finding about any home. The person on site decides.