The ignitor must pull a minimum of 2.9 amps in order for the oven safety valve to open. Set the multimeter so it can properly measure a resistance of 10 to 200 ohms. Disconnect the hot surface ignitor from the control board and measure the resistance. A good hot surface ignitor will have a resistance of 40 to 90 ohms.
How many amps does a hot surface ignitor draw?
Check the amp draw of the igniter; amperage should not exceed 4.75 A .
How do I know if my hot surface ignitor is bad?
- The Furnace Stops Running. When a furnace won't run at all, check for a bad ignitor. ...
- Your Furnace Blows Chilly Air. Unless you've set your thermostat to COOL, your furnace should not blow cold air. ...
- Does Your Furnace Short Cycle? ...
- A No Glow Ignitor. ...
- We Can Replace Your Furnace Ignitor.
What should an igniter ohm at?
Resistance should be between 37-68 ohms . If the igniter and the surrounding air are at about 70°F and the igniter wires are not connected to any other electrical components, the resistance of the igniter should not exceed 75 ohms. If it does, the igniter should be replaced.
How much voltage does a hot surface ignitor need?
When replacing a hot surface igniter, it is important to know the supply volts needed for the new igniter. Most hot surface ignitors work off of 120 volts . However, there are a few out there that work off of 240 volts. The Honeywell SmartValve Hot Surface Pilot Ignition uses 24 volts.
How does a hot surface ignitor work?
Hot Surface Ignition systems use an ‘M' or fork-shaped silicon carbide or silicon nitride igniter piece instead of a traditional spark igniter to light your gas flames. ... Once the flame sensing technology confirms the pilot is lit, it will allow gas to flow to the burner and ignite flames to the entire system .
Can you clean a hot surface ignitor?
It is not necessary to clean a hot surface igniter as it blow off any dust. However contrary to silicon carbide ceramic hot surface ignitor which are very brittle and shouldn't be touched, silicon nitride hot surface ignitor are very robust and can be cleaned manually iff really necessary.
How much does a hot surface ignitor cost?
The cost to have the hot surface ignitor in your furnace is around $195 , when out of warranty and installed by a local HVAC repair company.
What causes furnace ignitor failure?
As mentioned above, sometimes the cause of a furnace ignitor failing to ignite is due to a safety issue, such as a clogged air filter , for instance. ... So, if your furnace is failing to ignite, it's a good idea to check the air filter. If it looks clogged up, then this is probably the source of the problem.
How long should furnace Ignitor last?
Fortunately, you can replace the ignitor without replacing the full furnace. Most ignitors last about seven years . Keep reading to learn how you can tell if your furnace problem is a faulty ignitor.
Can you touch a hot surface ignitor?
Contamination. Some field experts say that the oils on the hands of technicians will cause the carbide tip to break down earlier than it should. Other experts say it won't. One thing is for sure, the fewer contaminants that touch the surface of this red-hot igniter, the better.
Why do hot surface ignitors go bad?
Most of the time when ignitors go bad that often it is because the ignitor is not shutting off after the gas in the furnace is ignited . If the ignitor stays on for an extended period of time this will make the ignitor short-lived.
