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Discussion Starter · #1 ·
The lcd display on my furnace alternates between b 26(soft lockout) and 9 116 then 115 and so on until it reaches 110. The heat does come on and heats the house. I have 2 zones of baseboard. I had the main circulator pump replaced 2 weeks ago. I called Burnham but they are no help at all. Anyone have an idea what it is. This happens all day long but the heat does come on.
 

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B26, boiler safety limit, or external limit wired to terminals 3 and 4 is open.


Check for these possibilities.

• Heating load at time of error was far below the minimum firing rate of the
boiler
• Defective primary pump or no flow in primary loop (Piping Method 1)
• Control system miswired so that boiler operation is permitted when no zones
are calling


that is from the install manual.
 

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Discussion Starter · #3 ·
Primary pump was replaced 2 weeks ago and the system was bled.
Not being a plumber I don't know what about the first possibility
Control system must be wired correctly because the was installed 2 years ago.
Today it has been running correctly
 
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