[Billm10454]

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.

 

[beenthere]

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.

 

[Billm10454]

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

 

[Billm10454]

The manual says that the 9 in the lcd screen means it is possibly a bad DHW sensor. Should I just change it even though I get heat and hot water?

 

[beenthere]

Can't tell you from here. may want to get one just incase.

 

[Billm10454]

The problem was the high limit switch. Replaces it now everything is running OK