AVS
Series
35
5.0
Maintenance
•
Troubleshooting Guide
*
NOTICE
Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed
during normal operation or the heater’s built-in safety mechanisms will be compromised.
Key
Start
Question
Process
Question
Corrective
Action
Is there 24V across
the circuit board with
terminal to ground?
No
Repair faulty wiring.
Check both high temperature spark
wires and both electrodes. If good,
replace circuit board.
Check for loose wiring or restrictions
in the hose connections to pressure
switches. Are they OK?
No
Replace wiring or hose connections.
Replace the pressure switch after verifying:
• Heater, fan blowers ,squirrel cage, intake
and exhaust are clean and free from dirt and
obstructions.
• The 4” air intake pipe does not exceed 30 ft. and/or
2 elbows.
• There is not a negative pressure experienced at
the area of air intake (e.g.; high winds, attic space,
tightly sealed building). May vary for agricultural
buildings (consult factory).
Yes
Yes
Summary of Contents for AVS-40N
Page 42: ...AVS Series 42 Notes...