E8 displayed, unit shuts down due to low indoor airflow or overheat

Safety: Turn off power at the circuit breaker before opening the air handler.

• Replace or clean filter: Locate the Fraser‑Johnston air handler filter rack or the return grille filter. Replace disposable filters or wash reusable ones. Use the correct size and MERV rating.
• Inspect ducts: Check for closed or blocked supply registers and return grilles. Open all registers and remove any obstructions.
• Check blower operation: With panels in place and power restored, set the thermostat fan to ON. If the blower does not run or is weak, inspect the blower motor, capacitor (if PSC), and the control board outputs.
• Clean indoor coil: If accessible, inspect the evaporator coil for dust buildup. Clean with a non-acidic coil cleaner and a soft brush.
• Reset error: After restoring airflow, power cycle the unit to clear the E8 error and test operation.