36
Symptom Action
1
Display not
illuminating
1. Switch off the mains supply to the product.
2. Check all wiring is correct.
3. Check external fuse(s) are intact. Replace if necessary.
4. Check the mains voltage is within specification.
5. Switch on mains supply.
If symptoms are still present return the product for examination.
Consider the likelihood that the product has been damaged from
mains borne surges / spikes. Consider installing an additional
ac power line protector between the product and the mains supply.
The protector needs to be positioned close to the product to gain
full protection.
2
Display
flashes
on and off
(1 second
approx.)
1. Switch off the mains supply to the product.
2. Disconnect all signal wires.
3. Switch the mains supply on: If symptoms are still present, return
the product for examination.
4. Replace each signal wire in turn until the fault occurs.
5. Investigate and rectify any faults in the wiring, external sensors /
transducers and modules associated with that connection.
Explanation
The internal power supply is unable to power up. If the voltages
cannot be generated, the power supply switches off for approx.
fault is still present, the cycle is repeated until the fault is removed.
This is a safety feature and does not damage the product.
9.2 System faults
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