Component Replacement Instructions
1. Turn off the gas supply.
2. Turn off the 120 V power supply.
3. Remove four screws securing the front panel.
Remove front panel.
4. On indoor models, remove the bracket holding
the controller (1 screw). (Figure 6)
5. Move aside the ignition line by pulling it out from
the clear plastic tubing. (Figure 6)
6. Remove the 5 screws that attach the gas
manifold to the combustion chamber (part of the
heat exchanger assembly). (Figure 7)
7. Remove the 2 screws that attach the gas
manifold to the gas valve. These screws are
machine screws and must be used at these
locations. (Figure 7)
8. Pull out the gas manifold and remove the
connector at the ignitor at the left side of the gas
manifold.
9. Remove the 3 screws attaching the gas
connection to the underneath side of the water
heater. (Figure 8)
10. Remove the screw attaching the gas valve to the
rear of the case.
11. Pull the gas connection down to disconnect it
from the gas control assembly.
Bracket screw
Figure 6
(indoor models)
Water line connections
Figure 7
5 screws
(gas manifold)
2 machine screws
(gas valve)
Figure 8
Regulator
screw
access
Gas connection
attached with 3 screws
On-Demand Gas Tankless Water Heater Service Manual
22
Gas Control Assembly
705e/o (ASME),
705i (ASME)