"Reset the unit" is the first instruction Takagi support gives for most issues. Three reset levels.
Level 1: error code reset
For any displayed error code, press the On/Off button on the controller for 3 seconds. The unit attempts to restart.
Level 2: power cycle
- Turn off the unit at the controller
- Turn off the breaker
- Wait 30 seconds
- Restore power and turn the unit back on
Level 3: service menu
Requires installer password. Don't attempt without installer guidance.
T-T cascade individual unit reset
For T-T cascade installs:
- Isolate the target unit via the cascade controller
- Reset that individual unit's controller
- Bring the unit back into the cascade
- Verify cascade rotation works correctly
When reset doesn't fix things
Three resets with immediate re-throw = real fault. Stop cycling and work through the specific code's diagnostic walkthrough.
Bottom line
Start with Level 1. For cascade, isolate individual units before resetting the whole array.