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Technical Literature Department 11 of 52 Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent
ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
BURNER
The images below show a complete blower/burner assembly removed along with a top view
of the water heater with the blower removed.
Service Notes - Burner (Flame Sensor)
The burner installed in the water heater is a radial fire burner. Radial fire burners can trap
debris that enter the blower. Be sure to thoroughly clean the edges of intake air pipe
sections after cutting during the installation. If this is not done plastic shavings can collect
inside the burner and lead to rough operation and/or ignition failure.
The burner should be removed and inspected whenever servicing for rough operation or
ignition failure problems. Burner removal requires removal of the blower. Blower removal
requires 8-10” long T handle 1/8” hex (allen) wrench.
The flame sensor will accumulate corrosion (rust etc) over time. This will reduce flame
sensing current. This is the most common cause of “Ignition Failure” lock outs. The flame
sensor should cleaned when servicing due to ignition failure and as a routine maintenance
procedure. Fine grade steel wool is recommended for cleaning the flame sensor; do not use
coarse abrasives such as sand paper.
Radial Fire Burner
Igniter
Blower VFD
Flame Sensor
Top View Water Heater - Blower Removed
Blower removal
requires 8 -10” long T
handle 1/8” hex (allen)
wrench.
Burner must be grounded
for flame sensing current to
be established. See Service
Notes - Electrical page 8
Burner Ground Wire
Blower Adapter
Assembly
Burner View Port
Blower Adapter