A bad gas valve in a honeywell appliance such as a water heater or furnace that is powered by natural gas can go bad and affect the performance of the unit.
Honeywell water heater gas control valve failure.
Because gas is involved problems with gas valves are a major safety concern.
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My honeywell water heater gas valve control is giving the 5 flash code sensor failure.
If you use the hot water which i now have to turn a little hotter than normal to get my desired temp then it eventually goes away and flashes normal operation 1.
Deliberately maliciously and probably under the pretense of safety.
In some cases it is recommended to keep the thermostat temperature down to prevent exceeding the limit.
A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all.
Troubleshoot the honeywell gas valve and the thermostat.
5 replace gas valve this indicates a sensor failure and the gas control valve must be replaced.