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29733 R2 06/01/2003
27
RIELLO 40F3 TROUBLESHOOTING CH
A
RT
Thermostat is calling for heat, burner is not running.
Reset control box.
Burner Starts
Burner Does Not Start
Test for 120 Vac Supply at sub-base between L and N or terminals #3 and #5.
120 Vac No Voltage
· Check system fuse, ensure service switch is ON.
· Verify that all control limits are closed.
· Verify 24 Vac at T-T on switching relay.
Turn off power supply. Remove control
box and jumper terminals #5 and #6.
Restore power.
Motor Runs Motor Does Not Run.
· Verify reduced voltage (42 – 52 Vac
between terminals #3 and #7.
· Ensure good contact between control box
spades and sub-base terminals.
· Defective control box / Replace.
· Verify electrical connections.
· Check for seized pump, motor, or fan
against housing.
· Defective motor capacitor.
· Thermal Overload (Hot motor).
Burner stays in Pre-purge
· Faulty CAD cell or seeing light before trial for ignition.
· Coil wires on terminals #1 and #2 or #1 and #8 reversed.
· Open coil circuit; terminals #2 and #8.
· Open coil circuit; terminal #1
· Defective 42 – 52 Vac supply, terminals #3 and #7.
· Defective control box / Re
p
lace.
Burner Continues to Purge and Light-off with Immediate Flame Drop-out
· Metal yoke for coil missing.
· Coil wire #2 and #8 reversed.
· Low resistance of coil holding circuit, terminals #1 and #2,
(
1350 ohms ± 10%
)
.
Burner Locks Out After Trial For Ignition
Continued on next page.