Heating Equipment Error Codes

18 error codes across 1 brands. Find your code, what it means, and how to fix it.

Miller

18 codes
Fault LED

Indicates a system fault condition.

L01: Thermocouple #1 Open

Signal indicates thermocouple number 1 is open (not functioning properly).

L02: Thermocouple #2 Open

Signal indicates thermocouple number 2 is open (not functioning properly).

L03: Thermocouple #3 Open

Signal indicates thermocouple number 3 is open (not functioning properly).

L04: Thermocouple #4 Open

Signal indicates thermocouple number 4 is open (not functioning properly).

L05: Thermocouple #5 Open

Signal indicates thermocouple number 5 is open (not functioning properly).

L06: Thermocouple #6 Open

Signal indicates thermocouple number 6 is open (not functioning properly).

L07

Output Voltage Limit — the output voltage has reached its limit, reducing available power.

L07: Output Voltage Limit

Indicates a limit on the output voltage due to operational conditions.

L08

Output Voltage Limit — the output voltage has reached its limit due to coil configuration or cable length.

L08: Output Voltage Limit

Provides options to address an output voltage issue such as increasing coil turns.

L09

Output Current Limit — the output current has reached its limit, reducing available power.

L09: Output Current Limit

Indicates a limit condition on output current due to operational setup issues.

L10

Output Current Limit — the output current has reached its limit due to coil configuration.

L10: Output Current Limit

Details potential adjustments for addressing an output current limit in system setup.

L11

Coolant Overtemp Limit — the coolant temperature has exceeded the maximum operating temperature.

L11: Coolant Overtemp Limit

Indicates overtemperature condition of the cooling system.

Limit LED

Indicates a system limit condition (open thermocouple or out-of-range parameters).