Operation instructions
4.2Lighting instructions
BSTOP! Read the previous safety information.
BThe gas valve must be turned off by sliding the gas valve button to all the way to the left.
Fig. 18
BWait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow “B” in chapter 4.1. If you don’t smell gas, go to next step.
BThe pilot burner window is located in the front center of the cover.
BSlide the gas valve button to the position 
.
Fig. 19
BFully depress gas valve button.
Fig. 20
BWith the gas valve button fully depressed, light pilot by pushing the piezo button. This step may have to be repeated.
Fig. 21
BObserve the pilot flame through the peephole. The gas valve button should be held down for at least 15 seconds with pilot burning before releasing. When the gas valve button is released, the pilot should continue to burn.
-If the gas valve button does not pop out when released, stop and immediately call your service technician or gas supplier.
-If pilot does not stay lit, repeat all steps.
-If pilot will not stay lit after several tries, slide the gas valve button all the way to the left and call service technician or gas supplier.
BThe heater will now fire at minimum power when water is drawn at a rate greater than the required activation flow rate.
Note: If main burner should fail to ignite, make sure pilot is burning. If not, repeat lighting steps.
Note: The GWH 425 PN operates in two modes. See
SETTING THE WATER TEMPERATURE.
4.3To turn off appliance
BSlide the gas valve button all the way to the left and turn off the installer supplied manual gas shutoff on the supply line to the heater.
Fig. 22
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