SYMPTOM FAILURE MODE ANALYSIS
Flue Gas Error
• Stack temperature has
exceeded the limit set on the
boiler.
• Measure the resistance of the flue sensor at room
temperature, it should be approximately 10kΩ.
• PVC: 149
o
F
• CPVC: 194
o
F
• Stainless Steel, AL29-4C: 210
o
F
Sensor Not
Connected
• Supply sens open
• Return sens open
• Stack sens open
• DHW sens open
• Verify that the sensors are connected
• Verify that they are wired correctly.
• Measure the resistance of the sensors, 10kΩ
sensors.
• Replace the sensor if necessary
Sensor Shorted
• Supply sens shorted
• Return sens shorted
• Stack sens shorted
• DHW sens shorted
• Verify that the sensors are connected
• Verify that they are wired correctly.
• Measure the resistance of the sensors, 10kΩ
sensors.
• Replace the sensor if necessary
Fan Not Turning
• A33 shown on display. Fan
refuses to rotate
• Check fan power wires
• Fan signal wires are interchanged
• Minimum fan speed must be greater than 1500 RPM
Air Switch
• Blocked flue error
• Check gas pressure switches, if
• Air Switch wire(s) is/are loose
• Air Switch is set too tight, reduce sensitivity by
Flame Detection
is out of Sync
• Flame detection is present
when no visible signs of a
flame exist
• Verify supply voltage for proper polarity.
• Check external wiring for voltage feedback
• Check internal wiring for proper connections
• Check the flame sensor and verify that it is clean
• Replace DynaMax Controller
Blank Display
Screen
• Blank display screen • Check S4 switch position on ignition module. Switch
is pushed towards J5 connector
• Check that display is connected to the standalone
connector on the back of the display
Replace fuse with factory 3.15A fuse.
• DO NOT use alternates as it may damage the
DynaMax Controller
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