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You light the pilot. if it will not stay lit,the thermocouple is bad.

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Q: How do you check hot water cylinder thermostat?
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How do you Check a thermostat on a hot water heater?

What type of thermostat (there are several, the commonest is a rod)?


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Thermostat and radiator


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The mark 8 could have a bad thermostat, or a bad water pump. Check the coolant level, then the thermostat and water pump. If these are ok, check the cooling fan circuit.


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Its too hot. Check the water pump or thermostat.


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Coolant not getting hot enough for thermostat to open?

Usually this is not the case. It looks like a bad thermostat, because no way the coolant is not getting hot, but a rusted up thermostat would not open for the coolant to circulate. If I were you I will change the thermostat first than check the water pump.


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