Visit www.carrier.com Troubleshooting Guide

The gas service pressure must not exceed 0.5 psig (14-in.wc), and be no less than 0.16 psig (4.5-in.wc). Thermostat wire connections to furnace at R and W/W1 are the minimum required for gas heating operation. W2 must be con-nected for 2-stage heating thermostats. Y/Y2 and G are required to be connected to furnace for cooling and heat pumps. G is required for continuous fan. COM-24V is ... ................
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