Omega OTEC IEWQ Series, Service Manual

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Installation and Maintenance
Service Manual
Analysis or processing of some of the malfunction display:
1. Compressor discharge protection
high.
Processing method: refer to the malfunction analysis in the above section.
2. Low voltage overcurrent protection
Possible reason: Sudden drop of supply voltage.
3. Communic ation malfun ction
Processing method: Check if communic ation signal cable is connected reliably.
4. Sensor open or short circuit
Processing method: Check whethers ensor is normal, connected with the corre sponding position on the controller and if damage of
lead wire is found.
5. Compressor over load protection
6. System malfun ction
Overload protection.When tube temperature(Check the temperature of outdoor heat exchanger when cooling and check the
temperature of indoor heat exchanger when heating) is too high, protection will beactivated.
Please refer to the malfunction analysis in the previous section for handling method .
7. IPM module protection
Processing method:Once the module malfunction happens,if it persists for a long time and can not be self-canceled, cut off the
power and turn off the unit,and then re-energize the unit again after about 10 min.After repeating the procedure for sever times, if
the malfunction still exists,replace the module.