Field Actions
DISPATCHAlways disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.
Frequently Asked Questions: Atlantic AL04
FAQ TREEWhat does error code AL04 mean on a Atlantic appliance?
Atlantic error code AL04 indicates: Atlantic Naema / Perfinox / Effinox / Varmax Gas Condensing & Hybrid Boiler: Diagnostic fault code AL04 registered by the microcomputer controller. Modulating gas valve solenoid coils electrical circuit malfunction.
What is the root cause of Atlantic error code AL04?
The primary root cause for Atlantic code AL04 is: On Atlantic appliances engineered with Siemens gas burner management microcomputer, stainless steel premix condensing heat exchanger, flame rectification ionization electrode (≥ 3.0 µA DC), and 10 kΩ primary heating NTC thermistors: dual solenoid modulating gas valve actuator open circuit or PWM driver stage MOSFET breakdown Metrological tolerance verification: safety shutoff coil 2.8 kΩ ± 150 Ω; modulating coil 45 Ω ± 5 Ω..
How do I fix or resolve Atlantic error code AL04?
To resolve error code AL04: Disconnect mains power before servicing. Unplug the harness at the main PCB and use a calibrated digital multimeter: measure DC resistance of both gas valve coils and check 24V DC / 230V AC drive voltage. Inspect contacts for pin oxidation or loose terminals. Replace defective part if out of tolerance, re-energize and clear error: Press and hold the illuminated 'Reset' button on the boiler fascia for 3 to 5 seconds until 'rSt' flashes on the digital display and burner pre-purge begins. If lockout repeats, verify gas cock is fully open and inlet pressure is 20 mbar natural gas / 37 mbar propane before further resets.
Is it safe to clear Atlantic error code AL04 by resetting power?
Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Atlantic code AL04 persists, the physical component causing On Atlantic appliances engineered with Siemens gas burner management microcomputer, stainless steel premix condensing heat exchanger, flame rectification ionization electrode (≥ 3.0 µA DC), and 10 kΩ primary heating NTC thermistors: dual solenoid modulating gas valve actuator open circuit or PWM driver stage MOSFET breakdown Metrological tolerance verification: safety shutoff coil 2.8 kΩ ± 150 Ω; modulating coil 45 Ω ± 5 Ω. must be inspected or replaced.
How do I test electrical resistance for Atlantic code AL04 using a multimeter?
Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..
What safety protocol must be followed before servicing Atlantic code AL04?
Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.
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