Hello,
I am having an issue with the following HVAC System:
Amana
80% Gas Furnace
GUIA090A50
P117305F
White Rodgers 50A50 Internal Ignition Control
Split System
Air circulation blower and induced blower will run continuously even after thermostat is turned off. Observation window indicates a continuous light flashing and according to manual is considered "Flame Sensed with no call for heat". Probable cause is listed as either a short to ground in flame sense circuit or miswiring. System was working fine until yesterday. Circuit board was replaced November 2010.
Since heating system was working all winter and AC up until a few days ago I do not think it is miswiring so what exactly is a short to ground in flame sense circuit and can I fix this myself? Would it help if I cleaned the flame sensor? Is there any other cause for this? Any assistance is appreciated and thanks in advance for your help.