29733 R2 06/01/2003
27
RIELLO 40F3 TROUBLESHOOTING CH
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
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.
