topic T04 error in Nest Thermostats

topic T04 error in Nest Thermostats https://www.googlenestcommunity.com/t5/Nest-Thermostats/T04-error/m-p/60690#M13641 <P>Heat won’t turn on. I have re set the thermostat and power is on for the system.  Was not connected to wifi all way due to low battery. I re charged and heat won’t turn on. Cooling will. </P> Fri, 10 Dec 2021 07:16:07 GMT NV 2021-12-10T07:16:07Z T04 error https://www.googlenestcommunity.com/t5/Nest-Thermostats/T04-error/m-p/60690#M13641 <P>Heat won’t turn on. I have re set the thermostat and power is on for the system.  Was not connected to wifi all way due to low battery. I re charged and heat won’t turn on. Cooling will. </P> Fri, 10 Dec 2021 07:16:07 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/T04-error/m-p/60690#M13641 NV 2021-12-10T07:16:07Z Re: T04 error https://www.googlenestcommunity.com/t5/Nest-Thermostats/T04-error/m-p/123273#M26741 <P>Did you ever find out what the issue is?</P> Tue, 15 Mar 2022 01:02:49 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/T04-error/m-p/123273#M26741 PJ4 2022-03-15T01:02:49Z