CleaverBrooks CFC-500 Operation, Service And Parts Manual page 107

Troubleshooting Chart
Symptom/Fault Indication
Erratic display/controller behavior
Touch screen not working properly
Burner can failure;
High Gas Pressure lockouts
Lightoff problems
Outlet Temperature High Limit lockout
Interrupted Air Switch lockout
Loss of flame
Part No. 750-263
Faulty electrical ground - Check ground terminals in control panel. System
should be grounded firmly to metal casing. External ground wiring may be
necessary.
Screen out of calibration - from Falcon home page, go to Setup/Advanced
Setup/Diagnostics. Under "Touch Screen" press <Calibrate> and follow
instructions on screen.
Incorrect gas pressure:
• Check regulated gas pressure and ensure it agrees with Table 4-3. Check
other equipment connected to gas main - regulator and gas supply
piping sizings should be based on all appliances being ON.
• A dedicated, properly sized gas pressure regulator is required for each
boiler.
• Customer connection should reduce to boiler gas train.
• Wrong gas pressure. Check regulated gas pressure and ensure it agrees
with Table 4-3. Check other equipment connected to gas main -
regulator and gas supply piping sizings should be based on all
appliances being ON.
• Incorrect fan speed settings - increase fan speed by 100 RPM
increments until successful lightoff occurs.
• Bad cable connections (ignition or flame rod)
• Electrodes fouled or improperly spaced - electrodes should be cleaned
or replaced and spacing adjusted.
• Debris on burner canister. To clean the unit, remove the burner can and
blow compressed air from the outside in. Vacuum up the residue.
• Electrical ground problem
• Insufficient water flow through boiler - closed water valves, insufficient
pump speed
• Air trapped in boiler
• Modulation set point and off point too close to outlet high limit setting
• Blower not running
• Blocked blower inlet
• CAPS switch defective or improperly wired
• Debris on burner
• Blocked condensate drain
• Combustion improperly set
• Flame rod fouled or out of position
Section 5 — Service and Maintenance
Possible Causes
5-5