Nortron 21D25 User Manual

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D SERIES ELECTRIC FURNACE

FB0004

INSTALLATION AND USER MANUAL

IMPORTANT

: READ AND SAVE THESE INSTRUCTIONS.

MODELS: 21D10, 21D15, 21D18, 21D20, 21D23, 21D25 AND 21D27

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Questions and Answers:

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Betty BarnesAug 19, 2025
Why Nortron 21D25 Furnace is not producing enough heat?
- T
  Tyler HullAug 19, 2025
  If your Nortron Furnace isn't producing enough heat, it could be due to several reasons: * One or more defective heating elements or relays. * The HEAT ACTIVATION switch is set to the LOW position. * Safety limits opening due to duct obstruction or dirty filters restricting airflow. * A defective or incorrectly wired two-stage or outdoor thermostat. * Lack of enough cold air returns in the house.

Nortron 21D25 Specifications

General

Brand	Nortron
Model	21D25
Category	Furnace
Language	English

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