No heat... Began at the thermostat to find the schedule was set to 62⁰F for daytime use. Reprogrammed! Unit was off on nine flashes, most likely due to the plugged filters and belt that needs to be repalced. Gas pressure is fine on both ends, but the gas valve terminal block is loose and a wiggle will shut the burner down. Diagnostic tools used Testo North America 868s thermal imager and 510 dual port manometer #hvac #hvacservice #noheatcall #hvacsystem #hvacbusiness #thermalimager #dualportmano