Costco Patio Heater Instructions: Setup, Lighting, and Fixes

Most Costco patio heaters are made by FireSense and run on propane with an electronic push-button igniter. To get yours running: confirm the AA battery is installed in the igniter chamber, open the LP cylinder valve fully, hold the control knob in for 2 minutes to purge air (especially on first use), then push the knob in and press the red igniter button. Hold the knob depressed for 30 seconds after the burner lights before releasing. That sequence covers the vast majority of Costco freestanding propane heaters sold from 2018 onward.

Figure out which Costco patio heater you have first

Before you follow any instruction path, you need to know exactly what you're working with. If you're looking for similar step-by-step guidance for a patio appliance, you can also review patio egg diffuser instructions as a related option. Costco has sold heaters under the FireSense brand across item numbers like 60368, 60485, 60786, 60788, and 61185. They look similar but have minor differences in assembly and ignition. The fastest way to identify yours is to check the sticker or rating plate on the heater itself, usually on the base or control box. It lists the model number, fuel type, and BTU rating. Write that number down and keep it with your receipt, because FireSense manuals have a blank serial number line for exactly this purpose.

Here's a quick breakdown of the main variants you'll encounter from Costco:

The overwhelming majority of Costco patio heater purchases are the freestanding propane mushroom-top style. The instructions in this guide follow that model family. If you need gardenline patio heater instructions, follow the manufacturer’s lighting and safety steps for your exact model before first use. If you have a natural gas model, the clearances and operation checklist are the same, but you won't be connecting a cylinder and there's no air-purge step since NG lines stay pressurized. Electric models are a completely different repair category. Check your rating plate before proceeding.

Unboxing checklist and assembly

Do not skip the parts check. It sounds obvious, but missing a rubber ring or the wrong screw size will halt your assembly halfway through, and Costco hardware is non-standard enough that a hardware store run won't always solve it. Lay every piece out on a flat surface and compare against the parts list in your manual before you touch a screwdriver.

A typical Costco FireSense freestanding heater box contains:

• Reflector and mesh reflector
• Protective guard(s)
• Glass tube(s)
• Stainless steel ring and rubber ring for glass tube connection
• Control box assembly (with burner/pilot components already attached in most models)
• Side and front panels
• Bottom plate
• Hardware bag: M5 and M6 screws, knob, washers, and flange nuts
• Hose and regulator assembly
• Instruction manual

Also check the hose assembly before you assemble anything. Look for cuts, abrasion, kinking, or any signs of wear. If the hose looks damaged, do not proceed. Contact FireSense customer service for a replacement before using the heater.

Assembly order

1. Attach the bottom plate and side/front panels to form the base cabinet. Use M5/M6 screws as specified in your manual diagram.
2. Insert the control box assembly into the base and secure it per the diagram.
3. Stack and connect the aluminum pole sections. Most FireSense models use 2-3 pole segments.
4. Attach the damper to the top of the assembled pole.
5. Connect the glass tubes using the stainless steel ring. Place the rubber ring in position and confirm the glass tube spring tabs sit on the outer edges before inserting. Do not force them.
6. Attach the reflector to the damper, then place the mesh reflector and secure the protective guard.
7. Connect the hose from the control box to the regulator. Hand-tighten first, then snug with a wrench (do not overtighten brass fittings).
8. Install the AA battery in the ignition chamber on the front of the control box: unscrew the red igniter button, insert the AA battery with the anode (+) side facing OUT, then replace the button.

Once assembled, do not connect the LP cylinder yet. Complete the safety placement and leak check in the next section first.

Placement, clearances, and the leak check you must do before first light

Where to put it

The FireSense manual is very specific about placement and these aren't suggestions. Place the heater on a hard, level surface outdoors only. Never bring it inside, into a garage, a tent, or any enclosed or poorly ventilated space. Carbon monoxide is odorless and accumulates fast in enclosed areas. If you ever feel dizzy, nauseous, or develop a headache while the heater is running, move to fresh air immediately and shut the unit down.

Required clearances from the manual:

• At least 36 inches of clearance above the heater from any combustible material
• At least 24 inches of clearance on all sides from combustible materials
• Wind speed below 10 mph at the operating location
• Hard, level surface only (no grass, uneven pavers, or soft ground that could tip the unit)

How to do the leak test

This step is non-negotiable before first use and after every cylinder change. Mix a leak test solution: one part liquid dish soap to three parts water (about 2 to 3 oz total is plenty). Connect the regulator to a full LP cylinder. Apply several drops of the solution to both the hose-to-regulator connection and the regulator-to-cylinder connection. Then slowly open the cylinder valve fully.

Watch both connection points for 30 seconds. Any bubbling at all means you have a leak. Turn the cylinder valve OFF immediately. Tighten the fitting and re-test. If bubbles keep appearing after several re-tightening attempts, remove the cylinder, set it outside away from ignition sources, and call FireSense customer service. Do not try to operate the heater with a confirmed gas leak.

Lighting your Costco patio heater for the first time

If you've assembled everything, placed the heater correctly, and passed the leak test, you're ready to light it. Follow this sequence exactly, especially the air-purge step. Skipping the purge is the number one reason a new heater or a freshly-reconnected cylinder refuses to light.

1. Open the LP cylinder valve fully (counterclockwise until it stops).
2. Push the control knob in and hold it for 2 full minutes. This purges air from the gas lines. Do not skip this on first use or after any cylinder swap.
3. Turn the control knob to OFF and release it.
4. Turn the control knob to roughly halfway between the small and large flame symbols.
5. Push the control knob fully in and press the red igniter button. You should hear a clicking sound and see ignition within a few clicks.
6. Keep the control knob fully depressed for 30 seconds after the burner lights. This allows the thermocouple to heat up and hold the gas valve open.
7. After 30 seconds, slowly release the knob. The burner should stay lit.
8. Adjust the flame level to your preference using the control knob.

If you're re-lighting a heater that was recently on, wait at least 5 minutes before attempting re-ignition. This lets residual gas dissipate so you're not igniting a built-up pocket of propane.

A properly lit heater should produce a steady, blue-based flame with some orange tips at the burner head. The flame should be consistent across the burner ring without gaps. The reflector will warm up and begin radiating heat within a couple of minutes. If anything looks or smells off, shut it down and troubleshoot before continuing.

When it won't ignite at all

If you've followed the lighting steps and the heater simply won't start, work through these checks in order. They go from simplest/most common to more involved.

1. Dead AA battery: this is the most common culprit. Unscrew the red igniter button, swap in a fresh AA battery with the positive (+) end facing out, and try again. The click you hear when pressing the igniter should be noticeably crisper with a good battery.
2. Air in the lines: if you just connected or reconnected the cylinder, you may not have purged long enough. Go back to step one and hold the knob in for the full 2 minutes.
3. Cylinder is empty or low: connect a known-good full cylinder and try again. Low gas pressure causes weak or absent ignition.
4. Igniter clicks but no spark visible: the igniter electrode may be misaligned or corroded. Try using a long-handled stick lighter (BBQ lighter) inserted near the burner orifice while holding the control knob in. If the heater lights with a manual flame source, the igniter is the problem, not the gas system.
5. Orifice or burner blocked: spiders and insects love to nest in the burner orifices. Remove the burner assembly, clean the orifice holes with a heavy-duty pipe cleaner, and use short bursts of compressed air to clear smaller debris. Reassemble and retry.
6. Loose connection somewhere in the gas line: check every fitting from cylinder to regulator to hose to control valve. Hand-check each one and re-run the soap test.
7. Pilot light assembly is bent or out of position: if your model has a pilot assembly, visually confirm it's properly seated and pointing at the thermocouple. A bent pilot tube that's even slightly off-axis won't heat the thermocouple enough to hold the valve open.
8. Regulator failure: if none of the above work, the regulator may have failed or gone into lock-out mode (some regulators trip a safety lock if they detect a fast pressure drop, which can happen if the valve was opened too quickly). Disconnect the regulator, wait 30 seconds, reconnect, open the cylinder valve very slowly, and try again.

When it lights then shuts off

This is the thermocouple problem in about 80% of cases, but there are a few other causes worth ruling out first.

Thermocouple and ODS sensor

The thermocouple is a small metal probe that sits in the pilot flame. When it gets hot enough, it generates a tiny voltage that signals the gas valve to stay open. If it doesn't heat up fast enough, or if it's worn out, the valve closes and the burner shuts off even though you lit it successfully. This is almost always why a heater lights and then goes out within a few seconds to a minute.

The fix: hold the control knob depressed for the full 30 seconds after lighting. Many people release it too early because the flame looks stable. If you've been holding it properly and the heater still shuts off within a minute or two, the thermocouple is likely worn and needs replacement. FireSense thermocouples are available from HVAC suppliers and online parts vendors. This is a DIY-friendly repair: disconnect the old thermocouple from the gas valve (it threads off), swap in the new one, position the tip in the pilot flame, and test.

Some Costco models also have an ODS (Oxygen Depletion Sensor) built into the pilot assembly. The ODS shuts the heater down if oxygen levels drop below a safe threshold, which is a safety feature, not a malfunction. If the ODS is triggering, it means you're operating in too enclosed a space. Move the heater to a more open outdoor area.

Gas supply and valve issues

If the thermocouple checks out, look at the gas supply side. A kinked or bent supply hose will restrict gas flow enough to starve the burner after a few seconds. Visually trace the hose from the cylinder to the control box and straighten any bends. Run a soap test after straightening to confirm no damage occurred at the kink point.

A blocked burner injector causes the same symptom: the heater lights, the flame is weak or uneven, and then it shuts off as the thermocouple fails to stay hot enough. Remove and inspect the injector, clean it with a pipe cleaner, and clear the orifice holes.

Tilt safety switch

Freestanding patio heaters have a tilt switch that automatically shuts off the gas if the unit tips beyond a certain angle. If the heater is on uneven pavers or soft ground, or if a gust of wind rocks it, the tilt switch will trigger. Make sure the heater is perfectly level on a hard surface. If it keeps triggering on a surface that looks level, place a small bubble level on the base to confirm. Some tilt switches can be jostled back into position by gently righting the heater fully upright; others require the unit to be powered off and reset before they'll allow re-ignition.

Safe shutdown, regular maintenance, and when to stop DIYing

Shutting down properly every time

Don't just pull the cylinder or flip a switch. The correct shutdown sequence from the FireSense manual is: push the control knob in and turn it clockwise to OFF, then turn the cylinder valve clockwise to closed, then disconnect the regulator. If you have a Thermacell Patio Shield, make sure it is turned off and allowed to cool down before performing any shutdown or maintenance steps how to turn on thermacell patio shield. Doing it in this order ensures no gas is left pressurized in the hose while it's stored or transported.

Maintenance you should actually do

The FireSense manual calls out specific maintenance tasks to perform regularly, and they're worth taking seriously because they prevent most of the ignition and shutdown issues described above.

• Clean the reflector and glass tube with warm soapy water whenever carbon deposits appear. Built-up carbon reduces radiant heat output and can cause hot spots.
• Clean burner holes and orifices with a heavy-duty pipe cleaner at least once per season. Follow up with short bursts of compressed air to clear fine debris. Spiders and insects nest in these orifices during storage and can fully block gas flow.
• Inspect the hose assembly before every use season. Look for cracks, abrasion, or stiffness in the rubber. Replace the hose at any sign of wear, not when it fails.
• Wipe down exterior surfaces to prevent surface corrosion, especially on the control box.
• Run a full soap-bubble leak test at the start of each season and after every cylinder swap.

Annual professional inspection

The manual requires that the heater be inspected by a qualified service person at least once per year. For most homeowners running a heater seasonally, this means having someone who services gas appliances check the regulator, valve, and thermocouple before the first use of the season. It's not expensive and it catches regulator diaphragm failures and valve wear that you won't catch visually.

When to stop and call for help

Some situations are beyond reasonable DIY territory, and it's important to recognize them. Stop troubleshooting and call FireSense customer service or a qualified gas appliance technician if:

• You can smell gas and cannot identify or stop the leak after several re-tightening attempts. Remove the cylinder outdoors away from ignition sources before calling.
• The control valve feels sticky, grinds, or doesn't turn smoothly. A damaged valve can fail to close fully, which is a serious hazard.
• The hose is cracked, blistered, or has visible damage. Don't operate the heater until it's replaced.
• The heater was knocked over and the supply line took a hard impact. Internal damage isn't always visible.
• You're smelling something burning from the control box or base cabinet (not the normal warm-dust smell on first use of the season).
• Any gas component looks corroded, scorched, or physically damaged beyond what cleaning can address.

If you're troubleshooting a different brand entirely, the diagnostic logic for thermocouple failures, ignition issues, and tilt switches is similar across most outdoor gas heaters. The same problem-first approach applies whether you're working through a generic setup or dealing with a specific brand's quirks.

For most Costco FireSense owners, the combination of a fresh AA battery, a proper 2-minute air purge, and a full 30-second thermocouple hold after ignition will solve almost every issue right away. Start there, and only move into parts replacement if those fundamentals don't fix it. If you also have a Thermacell patio shield, check the Thermacell patio shield instructions for proper placement and safe use around people and pets.