Mitsubishi Electric QAHV-N560YA-HPB Service Handbook page 135

[ IX Troubleshooting ]
Problem
The unit is in Supply-water tempera-
operation, but the ture on the secondary
secondary circuit side is high.
water is not
correct.
(when the sec-
ondary-side con-
trol is enabled)
Supply-water tempera-
ture on the secondary
side is low.
The unit is mak- The compressor is
ing a great deal of being flooded.
vibrations and
noise.
HWE1517A
Check item
The difference be- Water flow shortage on the secondary-
tween the supply-water side pump
temperature on the pri-
mary side and the sec-
ondary side is too
small.
The difference be- Excess water flow on the secondary-
tween the supply-water side pump
temperature on the pri-
mary side and the sec-
ondary side is too
Secondary-side flow sensor fault
large.
Error code 2616 (1) Capacity drop of the heat exchanger
was detected.
Error code 2616 (2) Capacity shortage of the heat exchang-
was detected. er
LEV fault in the main circuit
- 128 -
Cause
Reconfigure the system to increase the
maximum flow rate on the secondary-side
circuit. (e.g., Change the pump.)
Reconfigure the system to decrease the
minimum flow rate on the secondary-side
circuit. (e.g., Change the pump.)
Check the flow sensor and replace as nec-
essary.
Service or replace the heat exchanger.
Replace the heat exchanger.
Replace the LEV.
Solution
GB