Nu-Way MG860-LN T3S Installation & Maintenance Manual
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Contents
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15E.06.99 • G. 21.09.1125 TroubleshootingDefect determined: Flash code DMG972 Cause: Remedy:Burner motor does notstart up- Electric supply lead faulty Rectify faults in electrical installation- Fuse faulty Replace- Safety thermostat locked Unlock- Temperature of controller setting isexceededRenewed start attempt after temperaturedrop- Control box faulty Replace- Leak Rectify leak- No gas Safeguard gas supply- Gas pressure monitor faulty Replace the compact unit- Filter in compact unit dirty Clean or replace- Air pressure switch not in idle position Check air pressure controllerBurner motor faulty Replace- No load at terminal 5 Check plug connection and current path ofsolenoid valveMains voltage < 187 V Rectify faults in electricalinstallationBurner starts up andswitches to fault modebefore or after expiry ofsafety periodIonisation signal Solenoid valve leaky, replace compact unitAir pressure monitor does not switchthrough during pre-ventilationSee Page 6Ionisation monitoring device affectsignitionSee Page 7Gas solenoid valve does not open Replace the compact unitStarting gas quantity set too low Increase starting gas quantityNo ignition Check ignition electrode and setting, igni-tion transformer and cablePhase and zero mixed up Connect connector unit in correct phasesequenceIonisation monitoring device faulty Check according to Page 7Air pressure switch opens during oper-ationSee Page 6Gas nozzle dirty or faulty Replace gas nozzleFlame extinguishesduring operation- No gas Safeguard gas supply- Filter in compact unitdirtyClean or replaceFlame failure Wrong burner setting (see page 13)Air pressure monitor contact opens Check/replace air pressure switch (seepage 6)Flame signal too weak Measure flame signal, check ionisationelectrodeBurner motor starts upbriefly. Control unitswitches to fault modeAny failure flashcodeControl unit was notresetReset control unit faultAir pressure controller not inneutral positionCheck air pressure controllerControl box resets auto-maticallyIntermittent fault(10 sec.)Gas pressure monitor cause brief (1-5sec.) gas pressure fluctuations.Safeguard gas supply. Set the gas pres-sure switch and set a lower start point ifnecessary. |
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