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Low refrigerant charge: this code means that the refrigerant charge within the system is not adequate to run it without frosting the coils.
diagnosis: the refrigerant charge must be brought to within specified parameters. Possible causes of a low charge could include the following:
- The factory charge in Unionaire condensers is enough for the whole system with 13 feet of lineset, but may have been short, see the temperature/pressure chart to charge it within specifications.
- Leaking, the system may have a leak which must be located with a refigerant detector, or by a sop test, most leaks can be braised up, however, if a component such as a 4 way valve has developed a leak, it will need replacing.
- Lineset lengthened and/or increased in diameter. A lineset longer than 13 feet, or larger in diameter than that with which it came will require that additional refrigerant be added.
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