Hold / Lockout 9 Flame bias out of range

What the control is telling you

Control board reported the flame-sense bias outside its allowed window.

Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399

Likely causes

• 4-20 mA input driven above its limit
• Control board malfunction

Test and repair steps

1. If a 4-20 mA signal is wired in, keep it at or below 21 mA
2. Cycle power to the boiler
3. Replace the control if the code returns

Models that show this code

13 models in Trinity Tft

Other codes on the same units

• Hold / Lockout 85 Inlet/outlet inversion limit
• Hold / Lockout 88 Outlet temperature rise limit
• Hold / Lockout 88 Outlet temperature rise limit
• Hold / Lockout 9 Flame bias out of range
• Hold 100 Pressure sensor fault
• Hold 100 Pressure sensor fault
• Hold 110 Ignition failure occurred
• Hold 110 Ignition failure occurred