Buderus Logamax GB062-24 KDE H V2 Service Manual page 22

4
Fault finding
2E
Heating system charge pressure is too low (<0.5 bar). Water pressure switch is triggered.
Step
1. Check the system pressure.
Is the pressure <0,5 bar ?
2. Check the manometer and manometer
pipe. Is it defect or blocked ?
3. Check the expansion vessel precharge
pressure. Is it correct ?
4. Check the water pressure switch and
the connection cable for damages,
blockage or open circuit.
Is it correct ?
22
Remedy
yes: B Switch off the boiler.
B Check the boiler and installation for the water
leakage. In case of a leakage, repair it.
B Fill the system with water (>1 bar).
B Switch on the boiler.
2E ? --> 2.
no: --> 2.
B Switch off the boiler.
yes:
B Change the manometer.
B Fill the system with 8Ywater (>1 bar).
B Switch on the boiler.
2E ? --> 3.
no: --> 3.
yes: -- > 4.
B Switch off the boiler.
no:
B Correct the pressure. If necessary, change the
expansion vessel.
B Check the system pressure, if necessery correct it.
B Switch on the boiler.
2E ? --> 4.
yes: -- > 5.
no: B Switch off the boiler.
B Change the water pressure switch or correct the
cable connection.
B Fill the system with water (>1 bar).
B Switch on the boiler.
2E ? --> 5.
Logamax Plus GB062