Dishwasher displays F3; cycle may not progress beyond initial stages and water temperature is incorrect.

Safety first: Isolate power at the breaker before accessing the heater circuit.

• 1. Confirm heating issue: Run a hot cycle and check if the interior becomes warm after 15–20 minutes. If not, proceed with heater checks.
• 2. Inspect heater and wiring: Access the heater (flow-through or base element) from the bottom. Look for burned connectors or broken wires.
• 3. Test heater continuity: Disconnect the heater and measure resistance. An open circuit indicates a failed heater that must be replaced.
• 4. Check thermal cut-out: Some Haier models include a thermal fuse or thermostat in series with the heater. Test for continuity and replace if open.
• 5. Control board diagnosis: If heater and safety devices are good but no power is supplied during wash, the main PCB is likely faulty and should be replaced.

Warning: Never bypass thermal safety devices; they prevent overheating and fire.