Question about Heating & Cooling
This kind of Manual High Limit issue can most likely be caused by two things :
1) If it's a Knight XL (399MBH and up), it's equiped with a manual high limit with is located in front of the boiler, behind the front panel just under the display bezzel. It has to be adjusted and reset (with the manual reset button on the control display).
2) If your unit is NOT equipped with that kind of Manuel High Limit, this message means that there was a low voltage wire that was shorted to the ground. Either the flow switch or the thermostat wire. The 24v fuse located on the main control board burned to protect the components. Lucky, Lochinvar provide replacements in the small plastic bag attached to the connection board.
Hope this help. Even if i'm late.
Posted on Nov 11, 2010
Lockout is usually non confirmation of ignition. The control goes through a routine to verify flame. When none is detected the control locks out the ignition sequence and usually declares it only after a number of try's. 99% of the time the flame sensor is contaminated to the point it cannot sense the heat fast enough for the control. This video is of a high efficiency furnace with a lockout problem:
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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