37
Symptom Action
3
Product
powers up for
a period of
time (greater
than
1 minute),
then
switches off
1. Monitor the mains supply and ensure it is continuous and
within the specification limits.
2. Measure the ambient temperature and ensure it is less than
specified.
3. Investigate symptom 2.
Explanation
A re-settable thermal cut-out device will operate if one or more
of the following occurs:
- The power drawn exceeds the specification.
- The input mains voltage is lower than specified.
- The ambient temperature is higher than specified.
- The internal power supply will switch off until the product
temperature drops below 65°C. This is a safety feature and
does not damage the product.
4
Alarm light
switches on
constantly
after
commissioning
1. Select 'CLN' to the probe and attempt to re-commission the
system again.
2. Determine the probe condition (Section 9).
If: Symptoms are still present, return and replace the product.
Explanation:
The system cannot be calibrated with the measured conductivity.
Build-up of scale on the probe, usually caused by inadequate water
treatment.
Note: If this is the case, scale will also be present in the boiler,
and a competent water treatment company should be consulted
to avoid the possibility of serious boiler damage.
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