BLB
Master Spas
Blower/Light Circuit Fault (varies by model)
Display shows BLB or bLb and spa light does not work
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Shorted LED light harness, Failed spa light, Overloaded accessory circuit, Control board driver failure
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before inspecting lighting circuits.
- Inspect spa light: Locate the main LED light or light harness in the equipment bay. Look for water intrusion in the light housing.
- Disconnect light harness: Unplug the light harness from the control pack and restore power. If BLB clears, the light assembly is likely faulty.
- Replace light: Install a compatible Master Spas LED light assembly or light harness.
- Board fault: If BLB remains with the light disconnected, the control pack’s light driver may be damaged and the pack may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
LED Spa Light Assembly
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