The fan control board in the bottom supplies 120v to the SV9541 (connector C3). The SV9541 then supplies the 120v to the combustion blower ( connector C3). There is a relay on the SV9541 that controls it. The only weird thing I've found is the data line from the fan control board to the SV9541 is only 14v when the C1 is connected, but 27v when not.. sounds like your smart valve is defective. if your getting a heat demand from the control board then the control board has done its job. the whole ignition sequence and safety circuit is part of the smart valve. smart valve has an integrated circuit board built-it. normally if you had an ifc (integrated furnace control) separate from your gas valve you would be able to see any shorts or burnt.
Honeywell "Smart Valve"- SV9541- test procedure to confirm it's bad? 2zones_of_fun Member Posts: 1. January 2014 in Gas Heating. Hey everyone, I'm here at the Jersey shore where it's below freezing right now and of course this is the time my 2nd floor heat decided to take a powder. It's crazy cold outside and I'd like to get it back.. The plug to the c3 connection on the honeywell SV9541 seems to be lose if you press it during the start sequence the. Reid Lead Tech | Expert. 2,366 Satisfied Customers. My Honeywell furnace model sv9541 won't turn on. I can turn. GreenHeating | Heating specialtist - Oil industry - Veteran.