Split & Multi-Split
E409 means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060, EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060, EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060, EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060, EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060, SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060, SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060, SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
Air conditioner (outdoor), Heat pump (outdoor)
Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued. Check the indoor line voltage and transformer output voltage. The alarm clears after the voltage is higher than 20VAC for 2 seconds or after a power reset.
Outdoor control secondary voltage is 18VAC or less.
EL18XCV, EL18XCV-024, EL18XCV-036, EL18XCV-048, EL18XCV-060
Outdoor control secondary voltage is 18VAC or less.
EL18XPV, EL18XPV-024, EL18XPV-036, EL18XPV-048, EL18XPV-060
Outdoor control secondary voltage is 18VAC or less.
EL19KPV, EL19KPV-024, EL19KPV-036, EL19KPV-048, EL19KPV-060
Outdoor control secondary voltage is 18VAC or less.
EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060
Outdoor control secondary voltage is 18VAC or less.
EL22KCV, EL22KCV-024, EL22KCV-036, EL22KCV-048, EL22KCV-060
Outdoor control secondary voltage is 18VAC or less.
SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
Outdoor control secondary voltage is 18VAC or less.
SL25KCV, SL25KCV-024, SL25KCV-036, SL25KCV-048, SL25KCV-060
Outdoor control secondary voltage is 18VAC or less.
SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
Models: CBX40UHV
Air handler (indoor)
This manual entry does not list further causes or actions.
Compressor low voltage.
Models: CBK48MVT
Secondary voltage is below 18V AC. After 10 minutes, operation is discontinued. Check the indoor line voltage, transformer output voltage. The alarm clears after the voltage is higher than 20VAC for 2 seconds or after a power reset.
The secondary voltage for the air-hand- ler has fallen below 18VAC. If this con- tinues for 10 minutes, the icomfort thermostat will turn off the air-handler.
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
