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CLEANING THE COMBUSTION COMPONENTS
Procedure for cleaning the fan, burner, Flame Sensor and AFR, as used by all Service agents.
1) TOOLS ‐ Gather the following materials together:
a. A degreaser in a pump action bottle, Sandpaper, Philips Screw Driver, Needle‐Nosed Pliers, Duct
Tape, Flashlight, Air Compressor, Shop Vacuum, 3x Towels
2) POWER ‐ Disconnect power to your unit by either unplugging it from the wall outlet, or by the circuit
breaker, depending on the setup. The 3‐digit LED display will not be illuminated in standby mode
3) GAS ‐ Shut off the gas supply.
4) FRONT COVER ‐ Remove the front cover.
5) COMPUTER BOARD ‐
a. Remove the three screws, all wire clip connections, and move the computer board out of the
way.
b. Disconnect the three rods on the front face of the burner: flame sensor (orange wire), AFR
(yellow wire) and igniter (black wire)
6) MANIFOLD PLATE/GAS VALVE ASSEMBLY ‐
a. Remove the manifold plate screws. They are wide pan head Philips screws, located on the
edges of the stamped metal plate of the gas manifold
b. Remove the brass gas valve screw.
c. Undo the clip holding the Easy‐Link wires in place.
d. Disconnect the clear plastic tube from beneath the combustion chamber
e. Gently lift up the manifold & gas valve assembly to dislodge it from the gas inlet.
i. Do not lose the small gas filter screen.
Computer board:
Figure 31
Manifold Plate/Gas Valve Assembly:
Figure 32
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Troubleshooting Guide
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