Check if you have turned the gas valve knob to "on" position after lighting up the pilot. If so check for the continuity of the thermostat terminals using an ohm meter. If the thermostat is good, try replacing the thermopile, if it does not correct the problem, try replacing the gas valve. Make sure that the unit receives sufficient gas pressure and volume before doing part replacements.
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Check if you have turned the gas valve knob to "on" position after lighting up the pilot. If so check for the continuity of the thermostat terminals using an ohm meter. If the thermostat is good, try replacing the thermopile, if it does not correct the problem, try replacing the gas valve. Make sure that the unit receives sufficient gas pressure and volume before doing part replacements.