Error Code h01 66: Secondary Valve Stuck Off. The secondary valve control relay contact was not detected as closed within the secondary valve control relay contact closed time indicating that it is stuck off.
Brivis Error Code 66 Secondary Valve Stuck Off: The secondary valve control relay contact was not detected as closed within the secondary valve control relay contact closed time indicating that it is stuck off.
For Heater Repair Tech Only
Reason: The secondary valve control relay contact on the NG-2 was not detected as closed within the secondary valve control relay contact closed verification time indicating that it is “stuck off” If the secondary valve control relay contact is detected as closed within the allotted time, heating cycle control within the primary microcontroller proceeds to the next state – “FLAMEDETECT”. Service Check List: If Error 66 has occurred in the past on this heater then replace the NG-2 Module For a first time Error 66 reset NG-2 Module then retry heater operation.