5 flash 3 second pause error? Clean your sensor and fix it yourself! @cameraparts4you , Be extremelly careful working with your gas appliance, if unsure contact a Qualified Technician. Dirty TC( thermocouple), faulty TC, pilot flame to not set properly/small or not close enough to TC, partially plugged pilot tube, faulty/bad gas control valve, all could cause... - WV8860Q Honeywell Water heater
Residential Damper Atmospheric Vent Gas Water Heater General: Meets NAECA Requirements. All gas water heaters are certified at 300 PSI test pressure (2068 kPa) and 150 PSI working pressure (1034 kPa). All potable water connections are 3⁄4" NPT (19mm).