(Plus
models
only)
UV dose is adequate
and sensor is operating
normally
UV dose is near the
minimum required
Sensor disconnected; unplug system,
reconnect sensor and plug-in system
again
UV dose is below minimum required,
see Low UV Alarm section
Sensor inactive due to
lamp or power supply
failure
Lamp operating normally Warning; lamp will
require replacement
shortly
Lamp disconnected; unplug system,
reconnect lamp and plug-in system
again
Lamp failure; replace lamp
Lamp inactive due to
power supply failure
Power supply operating
normally
Air temperature around
system is too warm
Power supply failure; replace power
supply
Power supply inactive due
to lamp failure
Indicator lights only indicate a problem with the component when flashing red.
The table below is a list of possible causes and solutions. Before replacing parts, please contact Trojan
Technical Assistance for any new troubleshooting techniques. 1-800-265-5774
1 2 3
Lamp timer
display
Counts down from 365 days to show time for annual lamp replacement.
Lamp timer
reset
After installing a new lamp, press and hold for five seconds to reset Lamp
timer to 365.
Mute Press to silence audible alarm.
When the alarm is due to the lamp's age, the mute button will silence the
audible alarm for 7 days; this may be repeated up to a maximum of 4 times.
After that, the button will silence for only 24 hours.
When the alarm is due to any other issue, the mute button will silence the
audible alarm for 24 hours.
1
2
3
B
A
C
* Yellow indicator lights are a function of D4, E4, F4 and Plus models only.
For D4, E4, F4 and Plus models only.
BA C
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