14
How to test the Mirror Demister
The demister must be tested
before they have been installed
and again before mounting the
mirror. The resistance (ohms)
of each demister should be
measured. You should carry out the
following tests and should expect
the results detailed below:
Mirror Demister Resistance Test
Set a multimeter or ohmmeter to record resistance in the range of the
demister. Measure the resistance across the live (brown) and neutral
(blue) wires. Ensure the measured resistance is within the Reference
Resistance Band shown on Page 18 for the demister being tested.
Record the readings on the control card on Page 16 in line with the
installation procedure.
NOTE:
Due to the high resistance of the demister, it may not be
possible to get a continuity reading from the demister and as such,
continuity testers are not recommended.
When checking resistance, make sure your hands do not touch the
meter’s probes as the measurement will include your internal body
resistance and render the measurement inaccurate. If you do not
get the expected results or at any time you believe there may be a
problem, please contact Warmup’s Technical Team for guidance.