Maintenance; Troubleshooting - OHAUS Guardian 7000 Série Mode D'emploi

Guardian 7000 Series

3 MAINTENANCE

The Hotplate-Stirrer is built for long, trouble-free, dependable service. No lubrication or other technical user
maintenance is required. It needs no user maintenance beyond keeping the surfaces clean. The unit should be
given the care normally required for any electrical appliance. Avoid wetting or unnecessary exposure to fumes.
Spills should be removed promptly after the unit has cooled down. Before using any cleaning or decontamination
method except as noted in this section, users should check with the manufacturer that the proposed method will
not damage the equipment. Do not use a cleaning agent or solvent on the front panel which is abrasive or harmful
to glass, nor one which is flammable. Always ensure the power is disconnected from the unit prior to any cleaning.
If the unit ever requires service, contact your Ohaus representative. The user is responsible for carrying out
appropriate decontamination if hazardous material is spilled onto or into the equipment.
CLEANING CERAMIC TOPS:
First remove any burnt-on deposits or spills from the top plate with a scraper (similar to scraping paint off of
windowpanes). For your safety, please wear an insulated mitt when using a metal scraper. When the top plate has
cooled, apply a few dabs of a non-abrasive cleaner over the surface with a damp paper towel. As a final step, clean
with water, and wipe surface with a clean, dry paper towel.
CLEANING ALUMINUM TOPS:
For simple dust and dirt, clean the aluminum top by using a damp cloth with soap and water. For more stubborn
deposits, try using a flat edge wooden spatula to scrape off as much as possible. For more stubborn stains, try
using a couple of tablespoons of white vinegar to two pints of water and mix well. Dip a clean cloth into the mixture
and gently rub the exterior of the aluminum surface. Generally, it is not a good idea to use abrasive pads or
cleaners on aluminum, as the metal will scratch easily. If you must use some type of abrasive, try applying baking
soda to the surface and then rubbing with a moist cloth. This will work as well as most scouring pads and is less
like to create deep scratches in the surface. Be careful not to use steel wool or scouring pads as they can leave the
aluminum riddled with little scratches that make it harder to clean in the future. If you feel you must use steel wool,
use the finest grade you can find and use as sparingly as possible with as little pressure as possible. Go with the
grain rather than using circular motions.

3.1 Troubleshooting

The following table lists common problems and possible causes and remedies. If the problem persists, contact
OHAUS or your authorized dealer.
Error*
Unit fails to power on
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
*Note: Error code instances will stop equipment operation by default.
Cause of Error
Missing or blown fuse
Plate RTD open
Plate RTD short
No stirring motion / cannot reach
speed
Probe RTD open (Removing the
probe while the unit is heating)
Probe RTD short (Malfunctioning
probe)
A/D lock error
User Probe Error (Plugging the
probe into the unit while it is
heating)
Plate over temperature
Plate under temperature
Triac fault
.
How to Fix
Add or replace fuse as necessary.
Not fixable by user, please contact Ohaus.
Not fixable by user, please contact Ohaus.
Not fixable by user, please contact Ohaus.
Switch unit to standby, then return to normal
operating mode.
Switch unit to standby, remove the probe from the
unit, then return to normal operating mode.
Not fixable by user, please contact Ohaus.
Switch unit to standby, then return to normal
operating mode.
Not fixable by user, please contact Ohaus.
Not fixable by user, please contact Ohaus.
Not fixable by user, please contact Ohaus.
EN-43