Water Heater Turning off? Getting Error Code 110 or 61

Is your water heater turning off and displaying error code 110 or 61 on your Bradford White UCG100H399? Are you loosing hot water during peak usage times?

The problem could be with your gas pressure.

Gas pressure will fluctuate when all equipment is on in the building. If the gas supply line is small, the water heater may be having issues with the dynamic gas pressures.

  • On this particular water heater, the static gas pressure is rated between a minimum 4.5" wc and a maximum of 14" wc.
  • Dynamic gas pressure should not drop below 1.5”wc of the static gas pressure
  • Drops in gas pressures will normally be seen during peak times of usage when all equipment is being used
  • If the Dynamic pressure drops below 5”wc the water heater will not operate properly

When testing static gas pressure, you will have to ensure that all equipment is on and running. If you don’t, your readings my not be accurate

Hook up manometer to inlet port on gas valve and get static gas pressure reading

Turn on heater and wait for heater to fire. After 3- 5 minutes while heater is at full fire, check you dynamic pressure. If the pressure drops below 1.5”wc, there is a problem with either the gas supply or size of the gas line.

Double check the gas line size.

Double check the rating on the gas flex, if installed.

Verify the main gas line prior to the tee off for the water heater is sized adequately.

Increase the gas line to the water to a minimum 1 ¼” as close to the heater as possible.

Retest static and dynamic gas pressures.

If the problem persists there many be a different issue causing your loss of hot water.

Water Heater Man, Inc. has Service & Installation CentersĀ in Southern California and Metro Phoenix, Arizona


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