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Reznor 112754 M/R Blocked Flue Switch L175F

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Special Price $31.50 Regular Price $40.95
In stock
SKU
112754
The Reznor 112754 Blocked Flue Switch L175F is an essential component that is used to control the venting conditions & avoid unsafe operations in HVAC systems. This element works by sensing the presence of flue blockages and stopping the operation of the system until it is manually reset, preventing the burners and other parts of the system. It is usually fitted to commercial and residential furnaces and heating units, assists in the controlled operation, and ensures the correct conditions of the heating process during normal operation.
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HVAC Furnace Parts, Flue parts
Manufacturer:
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Manufacturer Name: Reznor
Product Number: 112754
OEM Part Number: 112754
Product Description: Blockedfluesw M/R, L175f
Weight:0.02lbs/9.07g

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Product Questions (2)
Customer Questions
What maintenance is required for the Reznor 112754 Blocked Flue Switch?

Inspect the blocked flue switch regularly for soot buildup and secure electrical connections. Ensure proper airflow around the sensing area. Replace if tripping becomes inconsistent. Regular checks can prevent furnace shutdowns and improve overall safety and combustion accuracy.

What are common issues with the Reznor 112754 Blocked Flue Switch?

  • False tripping due to restricted flue gases.
  • Sensor fouling from dust or soot.
  • Loose or damaged wiring connections.
  • Corrosion on switch terminals.
  • Intermittent furnace shutdowns from poor airflow.
  • Failure to reset after tripping.

Installation Steps

Step 1: Turn off power and gas supply to the unit and allow it to cool completely before starting.

Step 2: Remove front panel and locate flue sensing area, note existing wiring connections for reference.

Step 3: Disconnect old blocked flue switch and carefully remove from mounting bracket.

Step 4: Install new switch, secure it properly, and reconnect wiring as per original configuration.

Step 5: Restore power, test appliance operation, and verify safe flue airflow cutoff function.