RHEEM CLASSIC PLUS SERIES FURNACE General Troubleshooting
| CONF | DIAGNOSIS | PART MATCH | ACTION |
|---|---|---|---|
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96%
CONF
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High-Efficiency HVAC Air Filter (MERV 8-11)
Airflow restriction is the statistically dominant cause of short cycling. When air volume is insufficient to dissipate heat from the heat exchanger, internal plenum temperatures rise rapidly, triggering the bimetallic limit switch to cut the burner circuit to prevent heat exchanger cracking.
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VIEW ON AMAZON
#CommissionsEarned
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2%
CONF
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Flame Sensor Rod
This component uses flame rectification to prove combustion to the control board. Over time, silica and carbon deposits insulate the rod, preventing the microamp DC signal from returning to the IFC, which causes the system to shut down the gas valve immediately after the trial-for-ignition period.
SKU: 62-23543-01
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VIEW ON AMAZON
#CommissionsEarned
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2%
CONF
|
Primary High Limit Switch
The high limit switch is a normally-closed safety device that opens upon detecting excessive heat. If the switch has undergone excessive thermal cycling or mechanical fatigue, its internal spring tension weakens, causing it to 'trip' or open the circuit at temperatures well below the OEM safety threshold.
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VIEW ON AMAZON
#CommissionsEarned
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DIY Repair Guide
Watch exactly how to replace the High-Efficiency HVAC Air Filter (MERV 8-11).