Technical Diagnostic Search
Red Light Ring Continuous Beeping
The ghd Duet Style has engaged a critical safety lockout due to an open-circuit, out-of-range NTC thermistor reading, or thermal runaway condition on the low-temperature ceramic styling plates or air channel heating elements.
Sapphire Cooling Thermal Sensor Trip
Error code E2 indicates an open-circuit, short-circuit, or over-temperature condition at the negative temperature coefficient (NTC) thermistor monitoring the sapphire ice-cooling contact head and Peltier thermoelectric cooler (TEC). The MCU halts flash discharge and cooling drive to prevent epidermic thermal injury.
Qi2 Wireless Charging Thermal Disconnect
The internal PMIC (Power Management IC) and battery management system (BMS) trigger an autonomous wireless power transfer disconnect when the secondary Rx induction coil or battery temperature exceeds 43°C to 45°C. This safety lock initiates a thermal shutdown warning to protect lithium-ion pouch cells from thermal degradation.
GSP-RM RPC Timeout Failure
An XID 119 event indicates an RPC communication failure between the host kernel driver and the GPU System Processor (GSP) firmware on one or more Hopper SXM5 modules, leading to NVLink interconnect desynchronization, NVSwitch fabric stalls, and dropped NCCL collective communication rings.
Tank Booster Heater Thermal Cut-Out
Error code H91 indicates an open circuit on the domestic hot water (DHW) tank booster heater thermal cut-out safety circuit. The mechanical high-limit thermostat (typically tripping at ~85°C) has opened due to localized overheating, poor water circulation, scale accumulation, or dry firing.
AirTrigger Calibration Loop Failure
The ultrasonic AirTrigger transducer array fails hardware baseline capacitance/impedance checks, causing Armoury Crate to enter an infinite recalibration loop due to corrupted calibration registers or physical sensor flex desynchronization.
DDR5 Memory Not Installed
Q-Code 55 denotes 'Memory not installed', indicating the memory controller (IMC) failed to detect or train DDR5 modules during initial Power-On Self-Test (POST). This typically stems from uneven CPU socket mounting pressure bending LGA1700 pins, marginal memory training timing under aggressive XMP/EXPO profiles on cold boot, or insufficient VDD/VDDQ/MC voltage rail supply.
Compressor Overcurrent Trip
The outdoor unit inverter board detected an instantaneous current draw exceeding safety thresholds (typically >23A-28A peak) through the compressor power module (IPM), triggering an immediate protective shutdown to prevent catastrophic component failure.
HV Contactor Open Isolation Fault
BMS_b018 indicates that the Battery Management System detected an isolation breakdown (chassis leakage < 500 ohms/volt) across the high-voltage bus while main contactors were commanded open or during the pre-charge sequence, triggering an immediate vehicle immobilize safety lockout.
Bank Split Relay Malfunction
DTC P1A5500 indicates a fault in the high-voltage bank-charging contactor circuit. On the PPE platform, the 800V battery divides into two parallel 400V packs for 400V DC fast chargers. The BMS detected a state mismatch or welded/open circuit on the high-voltage split relay.