2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.10-2
The water pump is jammed:
If the cooling system is inactive or dry for a long period of time, it could occur that the
water pump doesn't start as it should, when the main switch is set on pos. 2.
The following instructions will assist you in solving the problem:
Remove the right-hand side panel of the analyser.
Remove the screw on the housing of the water pump.
The screw that appears next is coaxial to the internal pump shaft, rotate it and the
jammed shaft will be loosened. Up to 10 rotations may be needed to restore working
order.
Re-install in reverse order.
Please note:
If the message „No water flow“ appears because of dirty water or a failure of the board, it
is still possible to use the analyser, until a spare part is avaible.
1. Turn the main switch to position 0
2. Connect pin 2 with pin 8 of the 15-pin connector of ON21
3. Turn the main switch to position 2
CAUTION :
By-passing the safety circuit can cause more damages!
Analysing without a water flow can damage the furnace!
9
15
3 2 2 1 0
O N 2 1
1
7
8
2
D1 5-St if tl ei ste
1-11-2
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