ABNORMAL COMBUSTION 1) Blockage in the airway. Check the following areas: a. Venting length obstruction (Birds’ nests, trash, etc.) b. Backflow preventer installed backwards c.…

INCORRECT DIPSWITCH SETTINGS 1) Turn off the power supply. 2) Remove front cover and locate the dipswitches on the center of the computer board. 3)…

• The time it takes to deliver hot water to your fixtures depends on the length of piping between the two. The longer the distance…

Is the flow rate over 0.75 gpm? See if the unit initiates when you increase demand of water being drawn through the unit (e.g. opening…

Make sure the unit is installed properly using the Proper Installation section (p. 6) of this guide. Check the flow and temperature right at the…

The set temperature may be set too high. The temperature can be changed with dipswitches on the PCB or by the remote temperature controller, if…

Compare the flow and temperature at the pressure relief valve. o If the temperature and flow rate are correct at the PRV then the problem…

5.1 PRELIMINARY CHECKLIST Check all of these basic items before proceeding onto any other section: • GAS/WATER/ELECTRIC: o The gas supply valve should be fully…

1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the National Fuel Gas Code: ANSI Z223.1/NFPA…

Becoming familiar with how a tankless water heater normally operates may help to figure out what is wrong with it. Assuming it is properly installed…