What happens when a thermopile goes bad?

What happens when a thermopile goes bad?

The thermocouple can do this because, in its probe, it contains two different metals, and a voltage is generated when one of them is heated. This is the result of a phenomenon known as the Seebeck Effect. Nothing lasts forever, and when the thermocouple wears out, the pilot won’t stay lit and your appliance won’t work.

How do I know if my furnace gas valve is bad?

If you notice strange noises from your furnace, airflow distribution is weak, or it starts to cycle between on and off settings continuously, you likely have problems that don’t involve the gas valve. A service visit to troubleshoot the problem is needed.

What causes a weak pilot light on water heater?

A poor pilot flame – low gas pressure or blocked orifice. A flame that is set too small. An insufficient supply of gas. A bad or loose thermocouple.

How does pilot generator work?

Use of a pilot generator or a thermocouple in the flame provides heating appliance safety as it generates enough electric current from the burning flame to hold the gas valve open. If the pilot light goes out, the pilot generator cools off and the current stops, closing the gas valve.

What causes a thermopile to fail?

Thermocouple too tight of too loose on gas control valve. Tripped TCO, thermal cut off. Not enough fresh air. Bad gas control valve and ECO can cause pilot outage.

How do you fix a thermopile?

Replacing a Thermopile

1. Turn off the Gas Supply.
2. Disconnect the Wires.
3. Remove the Manifold Door.
4. Remove the Pilot Assembly and Thermopile Wire.
5. Place the New Thermopile Wire.
6. Feed the Wires Through the Manifold Door.
7. Install the Manifold Component Block.
8. Reconnect the Thermal Switch Wiring.

How much does it cost to replace a gas valve on a furnace?

Furnace Gas Valve Replacement Costs A furnace gas valve costs anywhere from $200 to $600 to replace. This part allows natural gas or propane to flow to your unit. It’s usually attached to the thermocouple for emergency cutoff when necessary.

How much does it cost to replace 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.

Can a pilot flame be too far from the thermocouple?

The pilot flame must be big and hot enough to heat the thermocouple to the temperature it needs to generate enough voltage to signal the gas valve. Sometimes the problem is simply that the thermocouple probe is too far from the flame.

How does the pilot work on a gas fireplace?

The pilot must generate enough Millivolts of electricity to open and close the gas valve. This also means that it uses a fair amount of gas. For a natural gas home, you pay for you gas by the Therm. A Therm = 100,000 BTU.

Why does my fireplace smell bad when the pilot is off?

Just one less thing to worry about when it is HOT out. With the pilot off, there are still trace amounts of gas molecules in the burner and pilot tubes of your fireplace. The gas companies add a chemical called Mercaptan to the gas which gives it that lovely odor we all know.

Is it better to turn the pilot light off or on?

Those are the facts to the best of my knowledge. For propane users, it seems to make sense to turn off the pilot light from a monetary point of view. Even if the pilot gets clogged while its off, it is a virtual wash in money having it serviced by a repair person. For natural gas customers it can really go either way.

How can you tell if a pilot generator is weak?

Most of the time they either put out nothing or about half that. If the pilot holds but the gas shuts down when the operator is jumped that is a good indication the generator is weak. Of course these cost way more than ordinary thermocouples because the energy produced from them is what operates the valve.

How do you test a thermopile pilot generator?

To test a thermocouple.You need a Multi meter set to dc volts in the millivolt range. Unscrew thermocouple from gas valve.

What to do when your generator is producing no or low voltage?

If your generator engine is running but is producing no or low output, the circuit breaker is the first thing you should check. The breaker is a safety feature designed to automatically switch off if a surge of electricity or overload is detected.

Why does my thermopile generator keep shutting down?

If the pilot holds but the gas shuts down when the operator is jumped that is a good indication the generator is weak. Of course these cost way more than ordinary thermocouples because the energy produced from them is what operates the valve. As a result you only need a cheap wall stat that makes and breaks.