Honeywell L8148J aquastat


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Old 04-28-20, 10:20 AM
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Honeywell L8148J aquastat

Manual switch doesn't work. Robertshaw millivolt gas valve. Aquastat is about 1 1/2 years old. It works in auto. Thanks for any help.
 
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Old 04-28-20, 11:13 AM
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The manual switch only bypasses the relay that is controlled by the thermostat.
If the boiler is up to heat..... nothing will happen when changing that switch.

The AUTO-MANUAL switch (only L8148J millivolt models) makes it possible to operate the burner (in a system with a millivoltage gas valve) during an electrical power failure. With switch at MANUAL, the burner operates continuously until either the high limit setting is reached or the switch is reset to AUTO. The circulator, requiring line voltage, is inoperative. When power is restored, the switch must be set to AUTO to resume automatic burner operation.

Do you have problem ?
 
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Old 04-28-20, 12:24 PM
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Thanks for your help. I had the temp up to 190 but the hi limit is at 180. I turned it back to 180 and that was the problem. Thanks again.
 
 

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