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If these are old style hot water radiators (the tall cast iron type) they probably are air-locked and need to be bled. There is a valve at one end near the bottom to do this. Open this valve slowly and with caution since it will initially release trapped air (under pressure) and then very hot water. Close the valve when it stops sputtering from trapped air.

If they are electric radiators, they might be burned out or have bad electrical connections. You will need an electrician to correct this problem.

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Q: Why are only two radiators in my home working after I changed my thermostat out with a new one?
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