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Watts AERCO Benchmark BMK750 - User Manual

Watts AERCO Benchmark BMK750
213 pages
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Heating and Hot Water Solutions
AERCO International, Inc. • 100 Oritani Drive • Blauvelt, NY 10913
USA: T: (845) 580-8000 • Toll Free: (800) 526-0288 • AERCO.com
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
© 2020 AERCO
Other documents for this product include:
OMM-0144, GF-217 Installation and Startup Manual
OMM-0146, GF-219 Reference Manual
TAG-0019, GF-2070 Boiler Application Design Guide
TAG-0022, GF-2050 Vent-Combustion Air Design Guide
TAG-0047, GF-2030 Benchmark Gas Guide
TAG-0048, GF-2060 Benchmark Power Design Guide
Applies to serial numbers:
G-20-1800 and above BMK750 5000N
N-20-0125 and above BMK5000 & 6000
Operations and Service Manual
Benchmark
®
Boilers
with Edge
®
[i] Controller
Natural Gas, Propane Gas and Dual
Fuel Modulating & Condensing Boilers
Models 750 through 6000
OMM-0145_D GF-218 11/2/2020
Disclaimer
The information contained in this manual is subject to change without notice
from AERCO International, Inc. AERCO makes no warranty of any kind with
respect to this material, including, but not limited to, implied warranties of
merchantability and fitness for a particular application. AERCO International is
not liable for errors appearing in this manual, not for incidental or
consequential damages occurring in connection with the furnishing,
performance, or use of these materials.

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Questions and Answers

  • K
    Kelly LyonsAug 8, 2025
    What to do if Watts AERCO Benchmark BMK750 shows O2 Sensor Malfunction?
    • R
      Robert LeonAug 8, 2025
      If your Watts Boiler displays 'O2 Sensor Malfunction', it could be due to a bad sensor, in which case you should replace it. Alternatively, there might be a communication issue; therefore, check the wires and connections.
  • K
    Keith RollinsAug 11, 2025
    What to do if Watts AERCO Benchmark BMK750 displays O2 Sensor Out of Range?
    • D
      Devin JohnsonAug 11, 2025
      If your Watts Boiler shows 'O2 Sensor Out of Range', it could be because the sensor auto calibration offset required is more than ±3%. In this case, reset the unit and recalibrate the sensor. It could also be due to a bad sensor, which would require replacement, or, rarely, a bad ECU, which should also be replaced.
  • M
    michaeltuckerAug 16, 2025
    Why is the O2 percentage low in my Watts Boiler?
    • C
      charles19Aug 16, 2025
      If the O2 percentage is low in your Watts Boiler, it could be caused by a dirty filter or poor combustion calibration. If this is the case, recalibrate the unit. It could also be due to an O2 Offset that is too low, in which case you should increase the O2 Offset value. Finally, a bad sensor could be the culprit, requiring replacement.
  • A
    Amanda DavidsonAug 21, 2025
    What to do if Watts AERCO Benchmark BMK750 displays Warning O2 Level High?
    • J
      jaredmaldonadoAug 21, 2025
      If your Watts Boiler is showing a 'Warning O2 Level High' message, this could be due to a Gas Pressure Regulator or Air Blower problem, or bad Combustion Calibration. A high O Offset could also be the cause. In some cases, a bad sensor may be the problem and should be replaced.
  • M
    Mr. Nathaniel HendricksAug 25, 2025
    What causes the O2 Warning Service Required on a Watts AERCO Benchmark BMK750 Boiler?
    • G
      Gloria MartinAug 25, 2025
      If the Watts Boiler displays 'O2 Warning Service Required', the issue might stem from the gas supply, air filter, or air blower. Alternatively, a bad sensor could be the cause and require replacement.
  • M
    Marvin MillsAug 29, 2025
    How to fix BV Hi Err on Watts AERCO Benchmark BMK750 Boiler?
    • D
      Diane ParsonsAug 29, 2025
      If your Watts Boiler displays 'BV Hi Err', check the air filter, gas regulator, and combustion calibration.
  • C
    Clinton HarrisSep 2, 2025
    How to resolve Max Iter error on Watts AERCO Benchmark BMK750?
    • K
      Kim McgrathSep 2, 2025
      If your Watts Boiler is displaying 'Max Iter', check the sensor calibration for inaccuracies. You can also try to increase the gain or iteration attempts.

Watts AERCO Benchmark BMK750 Specifications

General IconGeneral
BrandWatts
ModelAERCO Benchmark BMK750
CategoryBoiler
LanguageEnglish

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