Cooling Or Heating Capacity Is Not Enough.; The Whole System May Run Well While A Specific Indoor Unit Does Not Operate Quite Well - York R-410A Technical & Service Manual

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7.3) Cooling or heating capacity is not enough.

1) Address setting for the indoor units is wrong
Solutions: Do spot check of the indoor unit address and reset for those repeated ones.
2) Capacity code setting for the indoor units is wrong
Solutions: Do spot check of the indoor unit capacity code and reset for those repeated
ones.
3) Overcharge or lack of refrigerant
4) The system air leakage or alcidine leakage
5) PWM of the digital compressor leakage
Solutions: Please change a new PWM valve
6) 4-way valve leakage / blockade
Solutions: Replace with a new 4-way valve
7) Compressor leakage/ wear and tear
Solutions: Replace with a new compressor
8) Too many indoor units are connected. If all the indoor units are in operation, cooling/heating
effect will be lowered.
Solutions: (1) Avoid all the indoor units running simultaneously.
(2) Reduce the indoor units that connected in the system

7.4)The whole system may run well while a specific indoor unit does not operate quite well

1) Mode conflict
If within one system some indoor units are in cooling mode, while some others are in
heating mode, mode conflict will be displayed on those cooling units LED and as a result those
units will be power off.
2) Indoor sensor electric resistance changing
When the indoor sensor electric resistance changes to a certain extent, under the control
of the PCB, the indoor unit will stop running at the set temperature. Consequently the cooling
effect is weakened
3) Electric throttle kit blockade
Solutions: Use new electric throttle kits
4) EXV trouble of the power off units
If the refrigerant is leaked owing to EXV trouble of the power off units, the refrigerant will
run through that power-- off units. As a result the cooling/heating capacity of the operating
units is lowered.
Solutions: Replace all the bad electric throttle kits
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