Because gas is involved problems with gas valves are a major safety concern.
Honeywell water heater gas control valve failure.
Often blamed on sediment in the tank the 4 flashes is one of the most common problems with the honeywell gas valve.
When the circuit board in the gas valve detects the water too hot situation it writes something into static memory in one of its chips and the valve will never work again unless you can manage to reset it as described below.
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.
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.
Deliberately maliciously and probably under the pretense of safety.
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.
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.