Arrived to thermostat in heat mode set to 79 reading 69. Went to RTU#4 and cycled power. System went through operations, spark igniter was energizing but there was no flame. Checked gas valve for 24v only getting 2.1v. Checked through safeties at control board all safeties are closed. Control board has failed and is not sending 24v to gas valve. Need to replace control board for heat, noticed in previous invoices that RTU#4 has a leak in coils and is out of refrigerant. Due to amount of repairs to make system fully functional in heating and cooling need to get a comfort advisor to give a quote to replace system. Spoke with manager and she would like a quote to replace furnace control board and quote to replace system.