How do I test my Hot Surface Igniter

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Old 10-09-16, 08:49 AM
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Question How do I test my Hot Surface Igniter

I have a Carrier Weathermaker 9200 Gas Furnace Model # 58MXA060-12112. Unit has a LH33ZS004 HSI. Unit will not fire-up on its own. Furnace fires -up and runs fine if I ignite the gas myself. As a result I have narrowed it down to the Ignitor (I think). What I am not sure of is whether it is the Ignitor, the Ignitor Relay or something else.
My first question is what is the proper way to interpret the ohm reading I get when I test the ignitor? I have read that if it is not working the ohm reading would be 0 ( no conductivity)or if the reading is not between 30-60 it is non functioning, as well as other parameters. I removed the HSI and it test's at 78.3 ohms at room temp.
My second question is how do I test that the HSI Relay is working properly and getting power to the Ignitor.
 
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Old 10-09-16, 11:02 AM
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HSI can fail open (infinite or very high ohms) or shorted (near zero ohms).

Measure the AC voltage across the HSI terminals (with the HSI disconnected) when it is supposed to be on. You should measure line voltage (120 volts). If you do, then the igniter is likely bad. If you don't, then problem is elsewhere upstream.
 
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Old 10-09-16, 11:07 AM
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Measure the AC voltage across the HSI terminals (with the HSI disconnected) when it is supposed to be on.
If you find voltage...... plug HSI in and check again.

A problem relay can show voltage with the HSI disconnected but not connected.
 
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Old 10-09-16, 05:06 PM
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<< I removed the HSI and it test's at 78.3 ohms at room temp. >>


THE HSI sounds like it's good.

You also need to check for 120 VAC being applied to the HSI ----if the circuit board isn't turning on the voltage, the HSI wont heat up to light the gas.
 
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