Carrier 38VMH-1P Service Manual page 42

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E9 OR E.9.: EEPROM ERROR
DEFINITION
• E9: EEPROM damage
• E.9.: Unmatched data for EEPROM
POSSIBLE CAUSES
• Chip or main board damaged
• Wrong software in EEPROM
• Wrong EEPROM mode
A210283
Fig. 48 —E9 or E.9 Troubleshooting Chart
EA: DC FANS STAY AT ZONE A FOR MORE THAN FIVE MINUTES IN HEATING MODE
DEFINITION
Low pressure is too high even though the fan step minimum is T3 > 75°F.
POSSIBLE CAUSES
• Operation temperature is too high
• Temperature sensor (T3) error
• 4-Way valve cannot switch successfully
• Damaged main board
A210284
Fig. 49 —EA Troubleshooting Chart
*A Refer to resistance table of ambient temperature sensor in Appendix.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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