Thermostat Heater Control Circuit Low

Check these first

• A shorted thermostat heater element
• A heater wire shorted to ground
• Low battery voltage
• A failed heater relay
• Corroded heater connectors

What to do next

1. Check battery voltage
2. Test the heater circuit for a short to ground
3. Inspect the heater connector for corrosion
4. Test the thermostat heater relay
5. Replace the heater if the circuit stays low
6. Clear the code and retest

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