No voltage's present at the terminals, and the LED flashes red or stays lit.

Possible cause: Battery alarm or under-voltage protection triggered due to voltage dropping below 11V ± 0.1V. Connect a suitable charger to recharge the battery. If the issue remains unresolved, contact an authorised service agent.

Blue flashing for more than 5 seconds

Possible cause: Firmware update failure or firmware not present. Perform a firmware update. If the issue remains unresolved, contact an authorised service agent.

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Dometic • Lithium Battery

Dometic TLB100, TLB100F, TLB100S, TLB100SF, TLB120, TLB120F, TLB150, TLB150F

Official technical documentation and workshop diagnostics for TLB.

Technical Specifications

Operating Voltage12V DC

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	No voltage's present at the terminals, and the LED flashes red or stays lit.	Battery alarm or under-voltage protection triggered due to voltage dropping below 11V ± 0.1V	Connect a suitable charger to recharge the battery. If the issue remains unresolved, contact an authorised service agent.	DIY Check / Tech Fallback
`N/A`	Blue flashing for more than 5 seconds	Firmware update failure or firmware not present	Perform a firmware update. If the issue remains unresolved, contact an authorised service agent.	DIY Check / Tech Fallback