Opened front panel. LED light flashes 3 times, than pauses lit and then repeates the sequence.
House temp 17.5C, set Thermostat to 22C. Nothing happens.
Turned on and off thermostat. Nothing happens.
Checked fuse box, nothing blown.
Don't smell leaking gas.
Gas Water heater working fine.
Never worked on a furnace so need help.
55+" Samsung/LG TV