Flame Sensor Short; Flame Detect Error - A.O. Smith BTX 100 Service Handbook

fault messages
displayed message/Condition/indiCates

Flame Sensor Short

The Control System has detected the Flame Sensor is
grounded.
Flame Sensor Short
Fault occurred 2 mins ago
The flame sensor is grounded.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE

Flame Detect Error

The Control System has detected flame sensing current
out of sequence.
Flame Detect Error
Fault occurred 2 mins ago
Flame detected out of sequence.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
Important Service Reminder:
When performing any troubleshooting steps outlined in
this manual always consider the wiring and connectors
between components. Perform a close visual inspection
of all wiring and connectors to a given component before
replacement.
BACK ADVANCED
BACK ADVANCED
Servicing should only be performed by a Qualified Service Agent
possible Causes - CheCK/repair
• Check all wiring and plugs between the J4 spade
connector on the CCB (page 41) and the Burner
Adapter wiring harness behind the CCB enclosure.
Ensure no wiring is pinched/shorted. Ensure no bare
wiring is touching any grounded surface. Repair/
replace anything worn or damaged.
• Remove the Combustion Blower and Burner
Assembly to inspect the Flame Sensor and the
Burner Adapter wiring harness. See Combustion
Blower and Burner Removal on page 14.
Ensure the Flame Sensor is not damaged or touching
the Burner. There should be a 1/2 inch gap between
the Flame Sensor and the Burner. See Flame Sensor
on page 18. Replace the Flame sensor and/or Burner
Adapter wiring harness if worn or damaged. Adjust
gap between the Flame Sensor and the Burner.
• Call the toll free support phone number on the back
cover of this manual for further assistance if the
problem has not been corrected after performing the
procedures outlined here.
• The Burner has not shut down properly. Check 24
Volt Gas Valve for 100% closure. Check for flame
candling after the heating cycle has ended through
the Burner Sight Glass. See Figure 4 on page 9 to
locate the Burner Sight Glass.
• If burner flame is candling after the heating cycle has
ended - replace 24 Volt Gas Valve. See Gas Valve
Removal on page 24.
• Call the toll free support phone number on the back
cover of this manual for further assistance if the
problem has not been corrected after performing the
procedures outlined here.
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