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Troubleshooting - VWR International 1200 Series Installation And Operation Manual

Water baths

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TROUBLESHOOTING

Temperature too high
Display reads "HI" or "400"+
Temperature spikes over set point
and then settles to set point
Temperature too low
Display reads "LO"
Unit will not heat over a temperature
that is below set point
Unit will not heat up at all
Indicated bath temperature unstable
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TEMPERATURE
1/ Main controller set too high-see section 4.4
2/ Main controller failed on – call Customer Service.
3/ wiring error – call Customer Service.
probe is unplugged, is broken or wire to sensor is broken – call
Customer Service.
recalibrate – see section 4.5
1/ Main controller set too low – see section 4.4
2/ bath temperature not recovered from water being added –
wait for display to stop changing.
3/ unit not recovered from power failure or being turned off –
bath will need a minimum of 2 hours to warm up and stabilize.
4/ element failure – compare current draw to data plate.
5/ Main controller failure – confirm with front panel lights that
controller is calling for heat.
6/ wiring problem – check all functions and compare wiring to
wiring schematic in section 7.0 - especially around any areas
recently worked on.
7/ loose connection – call Customer Service.
1/ sensor is plugged in backwards – call Customer Service.
2/ if ambient temperature is lower than range of unit – compare
set points and ambient temperature to rated specifications in
section 7.0, Unit Specifications.
1/ confirm that amperage and voltage match data plate.
2/ confirm that set point is set high enough.
3/ check calibration – using independent thermometer, follow
instructions in section 4.5
1/ check amperage – amperage should be virtually at maximum
rated (data plate) amperage.
2/ do all controller functions work?
3/ has the fuse/circuit breaker blown?
1/ ±0.1 may be normal, especially without the use of bath cover.
2/ is ambient room temperature radically changing – either door
opening or room airflow from heaters or air conditioning ? –
stabilize ambient conditions.
6
Section
11

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