Rectify interference
6 720 643 196 (2010/02)
5
2.3.2 Tripped low pressure switch
Description: Too low pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display. IMPORTANT! The cooling circuit must be frost protected down to at least -15 °C.
Check Action
1. Has the heat pump been stationary for a
period or has it just been commissioned
with the compressor?
yes: B Acknowledge the alarm, restart the compressor
(restart menu).
Does the error message recur? Æ 2
no: Æ 2
2. B Manually operate G3.
Does G3 start? Does G3 run at 30%?
yes: Does the error message recur? Æ 9
no: Æ 3
3. B Measure the connection on terminal
blocks for G3 (Do2 - N).
Is there 230V?
yes: Æ9
no: B Check glass fuse, if intact replace I/O circuit
board.
4. Does the I/O circuit board transmit 3VDC
out on terminal block Ao2?
B Ensure that 10V control is selected
and that automatic pump control is
off. Example of correctly set Stratos in
10V operation running at 2600 rpm.
yes: B Check wiring, 0-10 V, to the stratos pump. If
intact, replace the pump.
no: Æ 5
5. Is the green LED on the I/O circuit board
flashing?
yes: B Check wiring between I/O circuit board and pump.
Æ 6
no: B Check the CANbus and electrical supply to the I/O
circuit board.
Does the error message recur? Æ 6
6. B Check the dirt filter on the cold side.
Is there dirt in it?
yes: B Clean the filter.
Does the error message recur? Æ 7
no: Æ 7
Tab. 2
6 720 643 196-01.1I
6 720 619 265-18.1I
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