Detroit Radiant Products Company FA Series - Manual (Page 42)

42
FA Series 4.0 Troubleshooting Guide
4.0 Troubleshooting Guide
Turn on control
device for heat.
Does the draft
inducer motor
turn on?
No
Yes
Limit switch is open or pressure
switch is stuck closed. Find
faulty switch and repair.
Does the
pressure switch
indicator light
turn on?
Yes
Does the circuit
board send
spark to the
electrode?
Yes
Does the valve
indicator light
turn on?
Yes
Continued on page 44.
Does the air circulating
fan turn on immediately?
Does the heater have 120 VAC
at the main power connection?
Find source of
electrical problem.
No
No Yes
Yes
Is the inlet or outlet of the
heater obstructed, or is
the vent exceeding the
recommended lengths?
No
Check for loose wiring or
restrictions in the hose
connection to the pressure
switch. Are they acceptable?
Remove obstruction or
correct vent lengths.
No
Does the electrode
appear to be
physically damaged?
Temporarily disconnect the igniter wire
from the circuit board and check for
continuity. Is there continuity?
Replace igniter.
Yes
No
Does the gas valve
turn on? Do you see
the burners in the
sight glass?
Replace wire.
Replace circuit
board.
Yes No
Gas valve
indicator light is
burned out.
Replace light.
Yes
Check inlet pressure to the heater. Is
it within the minimum and maximum
allowable range as per the rating plate?
No
Adjust inlet
pressure.
No
Yes Are the wires to and from the
gas valve properly connected?
No
Yes No
Yes
Does the gas
valve turn on?
No
Yes
Yes
Correct wiring.
No
Replace wiring or hose
connections.
No