Cadet 240V Baseboard Heater – Wall Mounted Thermostat Replacement
Customer called and said that the electric baseboard heaters are not working proper. The dial sticks and the details are worn off. Looking to restore correct working thermostat.
Today’s training will include:
Safe isolation of 240V circuit, thermostat accuracy testing, and like-for-like replacement of wall-mounted, double-pole, line voltage thermostat.
1. Safety Start with OFF
Contractor Responsibility
VERIFY 240V IS ABSENT WITH A METER
Confirm both legs are de-energized
Use insulated electrical tools
Note: 240V heaters use two hot legs. Always verify both before handling wiring.
2. Identify Thermostat Type
Confirm wall-mounted line voltage thermostat (not
low voltage)
Verify 240V rating
Check amperage rating matches heater load
Confirm single-pole or double-pole configuration
Inspect:• Burn marks • Loose terminals •
Discolored wiring
3. Testing Thermostat Accuracy
Restore power temporarily for testing
Measure supply voltage (L1 to L2 ≈ 240V)
Turn thermostat ON
Verify output voltage to heater
Compare room temperature to thermostat setting
Understand Baseboard Voltage loss vs.
Thermostat Break
4. Like-for-Like Replacement
Match voltage and amperage rating
Match pole configuration
Transfer wires one at a time
Secure connections tightly
Confirm proper wire routing inside box
Mount thermostat level and secure
5. Final Testing
Restore Power
Set thermostat above room temperature
Confirm heater energizes
Monitor heater with laser
Verify shut-off at approximate set temperature
Summary:
The customer noticed their baseboard heater was not holding temperature. Power was safely disconnected and verified at 240 volts. Testing confirmed the wall thermostat was not switching properly. A like-for-like replacement thermostat was installed, matched for voltage and amperage. After restoring power, the heater energized correctly and cycled off near the desired setting. The system is operating safely and as intended.
Electrical Shorts ⚡ Absolute Commercial
team education
absolutecommercial.com 
Leave a comment