Field Actions
DISPATCHAlways disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.
Frequently Asked Questions: Atlantic AL05
FAQ TREEWhat does error code AL05 mean on a Atlantic appliance?
Atlantic error code AL05 indicates: Atlantic Naema / Perfinox / Effinox / Varmax Gas Condensing & Hybrid Boiler: Diagnostic fault code AL05 registered by the microcomputer controller. Premix combustion air fan motor speed or tachometer feedback failure.
What is the root cause of Atlantic error code AL05?
The primary root cause for Atlantic code AL05 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: premix combustion fan brushless motor bearing seizure or Hall effect tachometer feedback open circuit Metrological tolerance verification: supply 230V AC or 24V DC; tachometer square wave 0V-5V DC proportional to blower RPM..
How do I fix or resolve Atlantic error code AL05?
To resolve error code AL05: Disconnect mains power before servicing. Unplug the harness at the main PCB and use a calibrated digital multimeter: check motor supply voltage and measure frequency / square wave output of tachometer wire. 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 AL05 by resetting power?
Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Atlantic code AL05 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: premix combustion fan brushless motor bearing seizure or Hall effect tachometer feedback open circuit Metrological tolerance verification: supply 230V AC or 24V DC; tachometer square wave 0V-5V DC proportional to blower RPM. must be inspected or replaced.
How do I test electrical resistance for Atlantic code AL05 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 AL05?
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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