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Chapter 10: Diagnostics and Troubleshooting
ID Symptom Description Possible Causes Actions & Solution
S2
When system is in
standby mode, either the
standby/on indicator or
hour meter display is o.
Control board is
defective.
Replace the control board. Refer to section 11.5.
S3
Hour meter display
shows disordered or bad
characters.
Control board is
defective.
Replace the control board. Refer to section 11.5.
S4
When the system is
switched to on mode,
the standby/on indicator
stays green and no light
is generated.
Control board is
defective.
Replace the control board. Refer to section 11.5.
S5
When the system is
switched to on mode,
the light is generated but
standby/on indicator and
over/under temperature
indicator are BOTH o.
Control board is
defective.
Replace the control board. Refer to section 11.5.
S6
When the system is
plugged into power
outlet, the over/under
temperature indicator is
illuminated in steady red.
The system
temperature is low
(under-temperature
condition).
Make sure the system is being used in the recommended
temperature range. Allow the system to warm up to the
ambient temperature before switching the system into on
mode. (The system fan turns on to help the device warm
up. When the system has warmed up to the ambient
temperature, the system fan will turn o, the over/under
temperature indicator will turn o, and the standby/on
indicator will illuminate green. This process may take
several minutes.)
Thermistor
wire harness is
unplugged.
Remove the unit cover and check whether the thermistor
wire is plugged into its corresponding connector on LED
driver board. Also conrm that the thermistor wire is not
disconnected at the other end (LED module). Refer to
section 11.6.
Thermistor wire is
defective.
Disconnect the thermistor wire on both ends and perform
a wire continuity test using a multi meter. Replace the
harness if necessary.
Control harness is
defective.
Remove the control harness and use a multi meter to
perform a wire continuity check on the harness wires.
Replace the harness if necessary.
Thermistor is
defective.
Make sure the system is being used in the recommended
temperature range. Allow the system to warm up to
the ambient temperature if needed. Disconnect the
thermistor harness from LED driver board side (P2
connector) and measure the resistance across the
harness wires using a multi meter. If the multi-meter
reads OPEN (high impedance), use a small wire to short
the pins of P2 connector on the driver board. If the over/
under temperature indicator starts ashing red, replace
the LED module (Refer to section 11.7). Otherwise, replace
the control board (Refer to section 11.5).
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