ERR170.00
Hydronic heat control freeze condition detected — HH FRZ DET
This code typically points to
- Hydronic heat coil freeze inlet temperature sensor reading is less than 38°F
Next checks to confirm
- Verify hydronic freeze sensor reading
- Inspect for actual freeze condition at the hydronic coil
Escalation
User Display
Reset behavior
Clears when freeze condition / freeze-sensor returns to normal.
Service Soon
Schedule repair