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I have a Burnham boiler that is not working. It is giving a "b26" soft error code. Any advice, other than placing a repair call tomorrow?
Do you have a pilot light ? And if so is it lit? Does this model have an exhaust fan? Did you turn the thermostat up ?
It is a Burnham Alpine. It does not have a pilot light that I can see. It sends exhaust out to the back of the house, although I can't see a fan. When I turned off the heating from the thermostats, the boiler recovered from the "b26" soft error code, and heated the hot water heater. But then, when I turned on the heating from the thermostats, it went back into the "b26" code. Again, I turned the thermostats off, and the boiler recovered.
A B26 error code indicates a defective supply sensor, a boiler safety limit or external limit wired across terminals 3&4, is open. other possible causes could be: • 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 (depending on how it's piped)If this is a bit foreign to you, you might want to call a professional. The latter seems the most likely based on your description.
Thanks. Can you clarify for me what some of these terms mean? For example, what is the supply sensor, and what does it "sense"? What is a boiler safety limit, and what is an "external limit wired across terminals 3&4"? What is/are "terminals 3&4"? I have a plumber here, but he has not narrowed in on the fix.
It senses water temperature. Your boiler either has the boiler safety limit or is wired across terminals 3 and 4. Do you have a manual for the plumber you have there now? From your description, the pump to me is suspect.
So the plumber has the manual. He does not believe it is the pump.The boiler keeps going through a cycle of "1-2-5" status codes. It has cycled through these codes continually. Burnham tech support is saying that after 5 cycles, the boiler should shut down. Maybe that is what happened initially. But it is not shutting down, it just keeps cycling. The manual says that status 1 is "pre-purge or post-purge". Status 2 is "ignition". It is only in status 2 for a second or two. Status 5 is "Checking air pressure switch". He has an electrician coming in to help. Any other ideas?
If it's not the pump I would guess it's your boiler safety limit or your MCBA return sensor. If you have the manual, go to page 68 and that explains basically what I relayed to you already.