U.S. Boiler Company ESC, Installation, Operating And Service Instructions

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27
TROUBLESHOOTING (continued)
Display / Status Recommended Corrective Action
StA 10
Retry / Recycle
Delay
StA 13
Soft Lockout
1. No Spark
a. Can you hear sparking while
STA 6
is displayed?
- If there is no spark noise replace the control.
b. If you can hear spark noise check the following:
- Loose connection in ignition cable or ground wire
- Continuity of ignition cable
- Break in ignition cable insulation
- Loose ground connection
- Break in pilot ceramic insulator
- Incorrect pilot spark gap
2. No Pilot Flame
a. If pilot does not light check the following:
- All manual gas valves are open
- Supply tubing is not plugged, kinked or leaking
- Gas line pressures are good
- Gas line is purged of air
- Pilot orifice is not plugged (pilot gas is flowing)
- Condensate quenching pilot
Note : It may be necessary to recycle the “call for heat” more than once to clear the pilot
supply tubes of air.
b. If no gas flow check the following:
- 24 volts across PV and MV/PV at gas valve, if voltage ok replace defective gas valve
- Check for break in wiring harness to gas valve
- 24 volts across control connector P5–2 and P5–5, if no voltage at control replace defective control
3. Spark does Not Stop When Pilot Lights
If the spark does not stop when the pilot lights check the following:
- Loose connection in ignition cable or ground wire
- Continuity of ignition cable
- Clean flame rod
- Pilot electrode porcelain cracked
- Pilot flame covers flame rod and is steady and blue, if not adjust pilot flame
- Low gas pressure at gas valve inlet
- Defective control
4. Main Flame Does Not Light
If the main burners do not light check the following:
- Check orifice size and/or blockage
- 24 volts across control terminals P5-8 and P5-5? If no voltage while in
STA 7
defective control.
- 24 volts across MV and MV/PV at gas valve? Check for break in wiring harness to gas valve
- Defective gas valve