Daikin furnace will not respond to thermostat; thermostat appears normal but no heating occurs.

Safety: Turn off power before working on low-voltage wiring to avoid shorting the transformer.

Steps to check:

• Check 24V fuse: Inspect and replace the low-voltage fuse on the Daikin board if blown, using the same rating.
• Float switch: If a condensate float switch is wired in series with R, ensure the condensate pan is not full and the switch is not tripped.
• Thermostat test: At the furnace board, temporarily jumper R to W to simulate a heat call. If the furnace starts, the thermostat or thermostat wiring is likely faulty.

Replace the thermostat or repair wiring as needed. If jumping R to W does not start the furnace, the issue is within the Daikin furnace controls and requires professional diagnosis.