Every callback on an appliance swap comes from the same place. The unit works. It heats, it tumbles, the customer is happy, and you are in the van. Two weeks later somebody smells gas, or the dryer takes three cycles to dry a load, and now you are back — unpaid, on a Saturday, explaining.
This is the sequence that keeps you from going back. It is written in the order you actually do the job.
Before you pull the old one out
Start with the connector that is already there, because moving the appliance is the risky part.
The Consumer Product Safety Commission warns about older uncoated brass connectors — the kind with soldered fittings. The solder can fail, break the connector and leak gas. CPSC put it bluntly: moving an appliance, even slightly, even just to clean behind it, can cause a weakened connector to fail. It recommends any uncoated brass connector be replaced immediately with a new stainless steel or plastic-coated brass one. CPSC linked these to 200 connector failures, 35 deaths and 59 injuries.
So: shut the gas off at the appliance valve first, then move it. And when you see uncoated brass behind an old range, that connector does not go back on. It is replaced, whatever the customer says about it being fine for twenty years.
The most dangerous moment of the job is the one before you have done any work.
The connector and the shutoff
A new connector, every time. Never the old one, never one that has been kinked, and never two joined together.
Length, type and fittings come from the appliance’s installation instructions — that manual is the controlling document for this install, and the numbers differ by model. Read the one in the box rather than the one in your head.
The shutoff belongs where somebody can reach it. A valve at the appliance is what lets a homeowner or the next tech isolate that one unit without killing gas to the house, and it may be required by the code adopted where you work. Leave the handle where its position is readable.
The shutoff is the first thing a fire department or the next tech looks for, and the first thing the customer will need at 11 p.m.
Dryer venting: where the callbacks actually live
More dryer callbacks come from the duct than from the dryer. The US Department of Energy’s installer job aid for venting a clothes dryer is short and worth working to:
- Rigid or semi-rigid metal duct. Not plastic, not foil flex crushed behind the machine.
- As short and straight as practical. Long runs and excessive bends are a fire hazard and make the dryer take longer — which is what the customer will call about first.
- No fasteners that penetrate into the duct. Screws inside the duct catch lint. That is the whole mechanism of a dryer fire, in one detail.
- Terminate outside. An attic, a crawl space or anywhere merely “ventilated to the outdoors” does not count.
- Backdraft damper, and no cage, grille or screen on the termination — the job aid points at International Residential Code section 1502.3 for that. A screen is a lint trap on the outside of the house.
- Insulate duct running through unconditioned space, where the authority having jurisdiction requires it.
- Over 35 feet of run needs a booster fan.
Before you leave, do what the US Fire Administration tells homeowners to do: check the venting behind the dryer is not damaged, crushed or restricted, and confirm the outdoor vent cover actually opens when the dryer is running. Go outside and look.
The duct is the one part of the install the customer cannot see and will never check.
The electrical supply
A gas range and a gas dryer still need power, and a swap is where this goes wrong — because the old cord and the new appliance rarely agree.
Work to the appliance’s installation instructions and the electrical code adopted where you are, and check three things before you energize it: that the cord and the receptacle are the same configuration, that the appliance is properly grounded per its instructions, and that the cord is new and undamaged rather than the one that came off the old unit. If the receptacle does not match what the appliance calls for, that is an electrical scope on the job — not something to solve with an adapter.
An adapter on an appliance circuit is the single easiest thing for an inspector, an insurer or the next tech to find.
The leak check, and the last look
Leak-test every joint you made, using an approved method from the manufacturer’s instructions. Never a flame — and do not use anything that can spark near a suspected leak, which is the standard warning every gas utility publishes.
Then clearances. The manual gives them, and for a dryer you also need room behind for the vent and its elbow without crushing it. This is the step that gets skipped, because the appliance is connected and working and the job feels finished. Slide it back slowly and watch the duct.
Last, run it. A dryer through a heat cycle, a range through every burner and the oven. Hand the customer the manual.
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Sources
This guide is general information to help you check your work. It is not legal advice or an official inspection, and it does not replace the requirements that apply to you, the manufacturer’s instructions, or a determination by an inspector or the authority having jurisdiction. Requirements vary by location and change over time; check the current rules where you work.
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