The main reason ventless gas heaters are not dangerous is because they are
all required by law to have an ODS pilot light that automatically shuts the whole unit off if it detects a low oxygen level
, which is usually caused by the presence of carbon monoxide.
How do you fix a gas fireplace that won’t stay lit?
- Before You Begin: Is Your Pilot Light Lit Inside Fireplace? …
- The Fix: Pilot Light to Gas Fireplace Won’t Stay Lit. …
- Check Your Thermopile Output with the TH/TP Contacts. …
- Don’t Replace Your Thermopile or Thermocouple Right Away. …
- Cleaning the Thermopile. …
- Re-test the Cleaned Thermopile.
Why does my ventless gas fireplace keep shutting off?
If you get dust in the pilot assembly and the pilot needs to be cleaned out, it produces a “lazy” flame, which will be disturbed by the draught of the main burners.
The flame lifts away from the thermocouple and causes the temperature on the tip of the thermocouple to drop
. This, in turn, makes the gas valve shut off.
Why does my gas fireplace shut off after a few minutes?
If you get dust in the pilot assembly and the pilot needs to be cleaned out, it produces a “lazy” flame, which will be disturbed by the draught of the main burners.
The flame lifts away from the thermocouple and causes the temperature on the tip of the thermocouple to drop
. This, in turn, makes the gas valve shut off.
How do you know if you have a bad thermocouple?
If you can’t get the flame to light at all, and you’re sure the gas is on, there’s probably an obstruction in the pilot tube.
If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds
, that’s the sign of a thermocouple malfunction.
How much does it cost to replace a thermocouple on a gas fireplace?
Estimated Cost:
$10 to $20
; What You’ll Need. The thermocouple on your gas furnace is a heat-sensitive device that transmits a small electrical signal to the gas valve to keep it open when the pilot is on.
What does it mean when your pilot light won’t stay lit?
If your pilot light won’t stay alight, it might be
the thermocouple
. Sometimes dust buildup collects on the thermocouple and blocks the sensor. Try cleaning the thermocouple and then relighting the pilot light. If it continues to go out, the thermocouple might need to be replaced.
Why will my gas fireplace not stay lit?
If the pilot light on your gas fireplace won’t stay lit, a very likely culprit is a component called
a thermocouple
. A thermocouple is a safety device and is a component of the ignition system. Its purpose is to not allow the gas valve to open if the pilot light isn’t lit.
Why does my fire keep going out in my fireplace?
Cold air trapped within a chimney can push down on the fireplace
and prevent waste air from leaving. This in turn can prevent fresh air from being sucked into the fire. If a fire doesn’t get hot enough to warm up the air within the chimney, it can cause a fire to go out soon after being started.
Do gas fireplaces turn off automatically?
Nearly every new gas fireplace comes equipped with safety features such as a 100% fail-safe shut-off valve.
If the pilot flame goes out, the gas flow will automatically turn off
. … This device automatically shuts the gas off if the temperature in the fireplace gets too cold or if too much carbon monoxide builds up.
How much does it cost to fix a thermocouple?
The thermocouple is an apparatus that senses whether the pilot light is lit and triggers the gas control valve. Repairs typically cost
about $150
to have it done professionally, though a new thermocouple itself only costs about $20 on average.
What is the most common thermocouple failure mode?
The most common failure mode for thermocouples is for them to fail open, this is known as
thermocouple burnout
. Burnout can result from a variety of reasons including the thermocouple experiencing a temperature in excess of that for which it was designed, metal fatigue, and oxidation.
Will a pilot stay lit with a bad thermocouple?
What is a Thermocouple? A thermocouple senses the heat of the pilot and allows gas to flow to the burner. A bad thermocouple will shut off gas to both the pilot and the burner so
the pilot light won’t stay lit.
How long does a thermocouple last on a gas fireplace?
Thermocouples are rigorously tested and should last
for years
. Indeed, experts believe a four-year check cycle is all that is needed to make sure things are functioning properly.
How long do thermocouples last?
Although thermocouples
can last several years
, they don’t typically last as long as the furnace. It’s time to replace the thermocouple if the main furnace doesn’t stay lit. Most hardware and home improvement stores have replacements in stock.
