No heat in suwannee. Arrived on site, customer complaint of main level furnace not heating, found bad flame sensor. While in attic I also found that the upstairs system had a bad flame sensor and a warn ignitor. I replaced both ignitors and cleaned both flame sensors until we can get them in stock and come back to replace them (eta, mid following week). Got both systems operational again for the moment. Went through the check list, also found a weak capacitor on both systems. Should read 5mfd, out of spec reading (3.7mfd main level) and (3.5mfd upstairs) recommend replacing both. Both systems are without secondary water safty to protect unit