Installed new heater it ran for 15 minutes and the gas cut off. The combustion fan and the fan keeps running, the only way to stop them from running is to throw the breaker. LED light blinks 4 times, book says that means a high limit switch and a roll over switch, I do not know what either one of them are. Could you please help
Heating & Cooling - Mr. Heater - MHU75NG
Answers & Comments
The high limit is an over heat switch that could mean the unit is over fired. you would need to time input or check manifold pressure. the roll out switch is a switch that shuts the unit off if combustion is spilling at the divitor on the unit where the vent connects. with this you need to check your venting
vance thanks. I can NOT see that my switches are tripped. I checked them yesterday and they are not tripped. My ventilation is good. How do I clear the 4 flashing code to try
normaly just turning the power off for 30 sec. would clear the falt code.if code doesnt clear either there is an open in the saftey wiring or the board went bad..i do not have a wiring chart for that if you do jumper the loop at control and see if that will clear