Troubleshooting
ESIE13-02
Part 4 – Troubleshooting
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1.2.9
Pump is Making Noise (Cavitation)
Applicable models
EHB*CA, EHV*CA
Error detection
method
Error generating
condition
Supposed causes -
corrective action
Possible causes
Corrective action
There is air in the system.
Purge air.
Water pressure at pump inlet is too low.
Check on the manometer on the unit that
there is sufficient water pressure. The water
pressure must be >1.5 bar.
Check that the manometer is not broken.
Check that the expansion vessel is not
broken.
Check that the setting of the pre-pressure of
the expansion vessel is correct (refer to the
installer reference guide attached in
Appendix to this Service Manual on page 23).
