Hitachi Yutaki M & Yutaki S fault 85

What it means

Float switch detects high level of water at drain pane, indicating malfunction of the drain pump. Requires 'Float switch' accessory configured as input signal.

Likely causes

1. Water float switch at drain pan activated (closed) due to high water level in drain pan
2. Blocked or malfunctioning condensate drain
3. Faulty float switch or wiring
4. Blocked or malfunctioning drain pump
5. Faulty float switch wiring or float switch stuck closed
6. Malfunction of the drain pump
7. High water level at drain pane
8. Compensation factor set to 0 disables compensation
9. OTC set to Fix mode disables compensation
10. Pump not operating within operating range
11. Blocked or restricted water circuit
12. Air trapped in water pipes
13. Clogged water strainer
14. Trapped air in hydraulic circuit after installation or service
15. Water leakage causing moisture on pump surface

Where to start

1. Check water level in drain pan
2. Verify float switch operation and wiring to Drain pump input
3. Check drain pan for blockage preventing water from draining