How to Get Your Home Ready for a Service Visit

Why this matters

Most of a service call is spent finding things out: what the equipment is, what it has been doing, what has already been tried, and who can say yes to the repair. When you have those answers ready, the technician spends the visit on the problem instead of on questions, and the repair is more likely to happen on the first trip instead of the second. Half an hour of preparation the night before does more for the outcome than anything you can do once the truck is in the driveway.

If the problem is an emergency, skip this article. A gas odor, a sounding carbon monoxide alarm, sparking or a burning smell from an outlet or panel, or water reaching anything electrical are not "get ready for the visit" situations. Leave the house for gas or CO and call from outside; for the electrical and water cases, keep clear and call. See related: When to Stop and Call a Licensed Pro Around the House.

Step 1: Write down what is happening and when it started

This is the single most useful thing you can hand a technician, and it is the one most people skip because they assume the tech will figure it out. They will, but a clear history can cut the diagnosis from an hour to fifteen minutes, because many faults look alike when the equipment is sitting still and only differ in how they started.

Write it on paper or in your phone, in plain words:

• What you noticed. "No heat" is a start. "The furnace starts, runs about two minutes, then shuts off and the fan keeps blowing" is far better.
• When it started, and what else happened around then. A storm, a power outage, a new thermostat, a filter change, a renovation, a very cold night.
• Whether it is constant or comes and goes. An intermittent problem may not show itself during the visit. Note the time of day and the weather when it happens.
• What you have already tried. A filter change, a thermostat battery, one breaker reset. Say so even if it feels minor; the tech needs to know what has been disturbed.
• Any sounds, smells or lights. Many furnaces, boilers and water heaters have a status light visible through a small window. If it blinks, count the blinks and write the pattern down. Do not remove a cover to see it better.

If you skip it: the tech asks, you answer from memory, and the details that would have pointed to the cause ("it only happens after it rains") never come up.

Step 2: Photograph the labels and the problem

Every appliance has a rating label with a model number and a serial number. The model number tells the tech which parts it takes; the serial number often encodes the manufacture date. A photo of each label, sent ahead or ready on your phone, lets the office check parts availability before the visit and sometimes lets the tech bring the right part on the first trip. See related: Reading the Labels on Your Furnace and Air Conditioner, and Reading the Label on Your Water Heater.

Photograph the problem itself too, before you clean anything up: the water on the floor, the stain on the ceiling, the error code on the display. A cleaned-up puddle tells the tech nothing about where the water came from. See related: How to Photograph and Record a Problem for Your Contractor.

If you skip it: a part that could have been ordered yesterday gets ordered today, and the repair moves to a second visit.

Step 3: Clear the path and the space around the equipment

The tech needs to walk from the door to the equipment carrying tools and sometimes a ladder or a replacement part, and then needs room to work in front of it.

• The path. Move boxes, bikes and laundry baskets out of hallways, stairs and the route through the garage or basement. Turn on the lights along the way.
• The work space. Clear roughly an arm's length or more in front of the equipment and around its sides where you can. A furnace with storage boxes stacked against its door cannot be opened.
• Attic and crawlspace access. If the equipment is in the attic, empty the closet shelf under the hatch. If it is under the house, clear the area around the crawlspace door.
• Outdoors. For an outdoor unit, a meter or a hose bib, unlock the gate and note any gate code.

Do not move the equipment, pull it away from the wall, or open its panels to "make it easier." That is the tech's job, and some panels interrupt power or expose live parts when removed.

Step 4: Put pets and children somewhere else

Doors are going to be open, and strangers are going to be carrying things through the house. Dogs that are friendly with you may not be friendly with a stranger kneeling next to their bed, and a cat can slip out an open garage door in seconds.

Put pets in a closed room away from the work area, or have them out of the house. Keep young children away from the work area too: open equipment, tools on the floor and a ladder are a bad mix with a curious three-year-old.

Step 5: Know where your shutoffs and panel are

You will not be asked to operate anything, but the tech may ask where the main water valve, the gas shutoff or the electrical panel is, and a few minutes of searching together is time billed to you. If you already know, say so when they arrive. If you do not, this is a good night to find out. See related: Your Home's Shutoffs: Water, Gas and Electric.

If your panel directory is blank or wrong, mention it. A tech who has to hunt for the furnace breaker by switching things off will tell you before they do it, but a labeled panel saves that step. See related: How to Label Your Electrical Panel Directory.

Step 6: Decide who can approve the work

This is the step that turns a one-visit repair into two visits more often than any other. The tech diagnoses the problem, explains the repair, and needs a yes before starting. If the person home is a teenager, a house sitter or a tenant who cannot approve it, the tech either waits while someone is reached or leaves.

Decide ahead of time:

• Who can approve, and how to reach them. If that is you at work, make sure you can take a call during the appointment window.
• A limit, if someone else is home. "Go ahead with anything up to the amount we agreed; call me for anything over that" gives the person at home an answer. Tell the office the limit when you confirm the appointment.
• Whether you want options or just the repair. Some people want the tech to call with two or three choices; some want the simplest fix done. Either is fine, but say which.

Step 7: Set up the morning

• Leave the thermostat or the equipment in the state that shows the problem, if it is safe to. A furnace that only fails after an hour of running is hard to diagnose if it has been off all night. If leaving it on is not safe (it smells hot, it is leaking, it trips a breaker), turn it off and write down that you did. Leave it off; it stays off until the tech has found the cause and decides it is safe to run.
• Have a place for the tech to wash up, and a spot to set down a tool bag that is not your white carpet.
• Have your records file handy if you keep one: past invoices, warranty papers, installation date. See related: Your House Records File and What Goes In It.

A worked example: a furnace that keeps shutting off

Here is what one homeowner had ready for a morning appointment in January. The furnace had started acting up two days earlier.

SERVICE VISIT NOTE - furnace, basement

WHAT: Starts, blows warm about 2 min, burner
      shuts off, fan keeps running. Repeats
      every 10 to 15 min. House drifting down.
WHEN: Started Tue night. Hard freeze Tue,
      about 5 F overnight.
PATTERN: Constant since Tue. Worse at night.
TRIED: New filter Wed AM (old one was gray,
       about 3 months). No change. Did NOT
       reset breaker or switch.
LIGHT: Window on lower door. Blinks 3 times,
       pause, repeats.
SMELL/SOUND: None unusual. Basement CO
       alarm tested Wed; it has not sounded.
LABELS: Photos of furnace label sent to
       office Wed. AC label also sent.
ACCESS: Basement stairs, light switch at
       top. Boxes moved off furnace front.
APPROVAL: Me, by phone, 8 to 12. Partner
       home, can approve up to our limit.
PETS: Dog in upstairs bedroom.

Why each line was worth writing. The pattern "starts, runs two minutes, shuts off, fan keeps running" is a different fault from "won't start at all," and the blink code narrows it further, often to the venting or a pressure switch circuit. The hard freeze two nights earlier mattered: on a high-efficiency furnace with plastic vent pipes, a frozen or blocked vent or intake outside is one possibility a tech checks early in cold snaps. The homeowner did not try to clear anything outside, which was right; they wrote down the timing, and the tech walked straight to the vent termination on arrival.

What they left alone. They did not reset the furnace switch over and over. Repeated restarts can mask the original fault, and on some furnaces cutting the power clears the stored fault code the tech would have read. They did not open the furnace door to read the light better. And they did not pour hot water on the outside pipes, which can crack fittings and is not a homeowner fix.

The approval line paid off. The repair was small, under the limit they had set, so the partner said yes at the door and the visit ended with heat instead of a callback.

What would change this

• The equipment is in a rental unit. If you rent, the approval almost always belongs to the landlord or property manager. Find out before the visit whether the tech is allowed to start work on your say-so, or whether the manager has already set a limit with the company.
• The problem is intermittent and not happening that day. Your written pattern is now the whole diagnosis. Add photos or a short video of the problem happening if you can capture one safely, such as a recording of a noise or a photo of the display when the error shows.
• The visit is for a new installation, not a repair. The preparation shifts toward space and access: the route a large unit will travel, door widths, where the old equipment goes, and where the crew can park and stage.

What you can leave to the technician

You do not need to diagnose the problem, find the part number inside the cabinet, clean the equipment, or figure out whether it is worth repairing before the tech arrives. You do not need to apologize for a dusty basement. The tech will explain what they found and what your options are. Your job is the history, the access, the approval and the safety of the people and animals in the house. Everything that involves opening the equipment belongs to the person with the license and the tools.

See related: What to Expect During a Service Visit.

References

• See related: When to Stop and Call a Licensed Pro Around the House
• See related: Your Home's Shutoffs: Water, Gas and Electric
• See related: Reading the Labels on Your Furnace and Air Conditioner
• See related: How to Photograph and Record a Problem for Your Contractor
• See related: What to Expect During a Service Visit