With Gas Furnace; Gas Furnace Lockout Reset - Daikin VRV Aurora RXLQ-TATJU Series Service Manual

Symptom-based Troubleshooting
1.2

With Gas Furnace

The gas furnace does not start operation.
1
Operation does not switch from heat pump to gas furnace in
spite of low room temperature. Operation does not switch from
gas furnace to heat pump even though the room temperature is
nearing the set temperature.
2
AA-03 (Gas furnace abnormality) is indicated on the remote
controller while no error is indicated on the PCB of the gas
3
furnace.
The airflow rate indication on the remote controller is not
consistent with the actual airflow rate of the indoor unit.
4
1.3

Gas Furnace Lockout Reset

Furnace lockout is characterized by a non-functioning furnace (circulator blower may be running
continuously) providing a diagnostic LED code located on the furnace board.
Lockout results when a furnace control detects abnormal conditions. If the furnace is in "lockout",
the following methods can be used to clear the error.
a. Turn the remote controller OFF to clear the error. If the error is not cleared, proceed to next step.
b. Heat pump lockout conditions are met.
c. Set the setting temperature to maximum, then turn the remote controller ON.
d. Turn the remote controller OFF.
e. Turn the remote controller ON after around 15 seconds from procedure d.
The procedures c, d, and e will not work during certain outdoor unit operations, i.e. defrost, startup,
compressor stop, service mode etc.
If the LED of the ON/OFF button is flashing when you turn the remote controller ON, you cannot
clear the error with the method above. In that case, the error must be cleared using the gas
furnace. Refer to the gas furnace operation manual for more details.
211
Symptom Supposed Cause
The gas furnace does not start operation while the compressor is
during operation or under stop-control, or right after defrost IN or
defrost OUT. Wait until the operation becomes stable.
This function is performed only with outdoor units which support
automatic switching between gas furnace and heat pump
interlocking with room temperature.
Some models are enabled to support automatic switching
between gas furnace and heat pump interlocking with outdoor air
temperature by setting heat pump lockout on an outdoor unit
side. However, the compressor stops while gas furnace is during
operation.
In some cases of gas furnace abnormality, error indication on the
remote controller is retained even after the abnormality is
removed. Execute combustion heating operation once or reset
the power source.
The airflow rate of the indoor unit during gas furnace combustion
heating depends on the intensity of combustion.
Therefore, the airflow rate of the indoor unit does not reflect the
airflow setting of the remote controller.
SiUS341802EC
Part 6 Service Diagnosis