Thermostat cannot control Stelpro heater with built-in fan (fan does not run or runs continuously)

Safety: Turn off power at the breaker before working on wiring. Fan-forced heaters often involve multiple circuits.

Steps to troubleshoot fan control:

• 1. Confirm compatibility: Verify that your Stelpro smart thermostat is rated to control fan-forced heaters and supports the required wiring configuration.
• 2. Check wiring diagram: Compare actual wiring to the Stelpro heater and thermostat manuals. Ensure fan and element circuits are connected to the correct terminals.
• 3. Configure mode: In the thermostat settings, select the appropriate heater type (fan-forced) if available.
• 4. Test fan separately: With power OFF, temporarily connect the fan circuit directly to line (following all safety rules) to confirm the fan motor itself works.
• 5. Use appropriate control: If the heater requires low-voltage control, replace the line-voltage thermostat with a compatible low-voltage model and use a relay or contactor as specified by Stelpro.
• 6. Replace thermostat: If wiring and configuration are correct but the fan output still fails, the thermostat's fan control relay may be defective. Replace the thermostat.

Warning: Incorrect wiring can damage the heater and thermostat and create a fire hazard. Consult an electrician if unsure.