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Hach 205 - Troubleshooting

Hach 205
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11
TROUBLESHOOTING
FOR PERSONAL SAFETY, ALWAYS DISCONNECT THE POWER BEFORE
SERVICING. Always make a visual inspection of the incubator and control
console when troubleshooting to find loose or disconnected wires which may be
the source of the trouble.
TEMPERATURE
Temperature too high
1/ controller set too high-see section 4.4
2/ controller failed on – call Customer Service
3/ wiring error – call Customer Service
Display reads "HI" or "400"+
probe is unplugged, is broken or wire to sensor is
broken – trace wire from display to probe; move wire
and watch display to see intermittent problems
Chamber temperature spikes
over set point and then settles to
set point
Recalibrate – see Section 4.5
Temperature too low
1/ high limit set too low – see section 4.6
2/ controller set too low – see section 4.4
3/ unit not recovered from door opening – wait for
display to stop changing.
4/ unit not recovered from power failure or being
turned off – incubators will need 24 hours to warm
up and stabilize.
5/ element failure – see if heating light is on;
compare current draw to data plate.
6/ controller failure – confirm with front panel lights
that controller is calling for heat.
7/ high limit failure – confirm with front panel lights
that Safety is operating correctly.
8/ wiring problem – check all functions and compare
wiring to schematic - especially around any areas
recently worked on.
9/ loose connection – check shadow box for loose
connections.
Display reads "LO"
Section
6

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