I have recently purchased a house with a Brivis Buffalo 85 EMS gas ducted heating unit. Unfortunately I have no idea on how old the unit is as there was no documentation or instructions left when I moved in. Now that winter has arrived I have powered the unit on and I have been having some intermittent issues which I am hoping some of you could assist me with.
The issues I am having are as follows;
- Poor airflow from all ducts
- Intermittent OH/F & OH/S errors on the control board
This morning I awoke to a cold house and no air flowing from the ducts. I checked the unit and the fan was running however the burners and pilot light were off. The control board was showing an OH/F (overheat fan?) error. I reset the unit and the pilot light kicked in and lit the burners, the fan started and I went back inside. After a few minutes I again checked the ducts and again there was nothing coming out of them. Upon returning to the unit, the burners were out, fan was running and the OH/S error was showing on the control board.
I'm trying to determine what is the likely cause of these errors? I can get to and replace the pilot burner easily if needed but I'm not sure if this will fix the problem. Having done some reading I think the flame rollout sensor might need replacing but I have no idea where to find this on my unit.
Attached are photos of my unit. The control board is currently showing everything as green however the OH/F & OH/S errors are intermittent.
Any help would be appreciated. Thanks.
Brivis Buffalo 85 EMS