VIII Check-out procedure — troubleshooting
TS-3: Pilot lights — Main valve will not come on - continued from previous page
Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off power before proceeding could cause severe personal injury or death.
To check ignition system grounding (instruction for continuation of
Pilot assembly and ignition control must share common ground with main burner. Nuisance shutdowns are often caused by poor or erratic ground.
❏Check for good
❏Check ground lead from GND (Burner) terminal on ignition control to ignition control mounting screw and from C on transformer to transformer case ground. Make sure connections are clean and tight. If wire is damaged or deteriorated, replace with No. 18 gauge
Are pilot valve wiring connections CORRECT and securely fastened?
No
Yes
Connect securely to terminal PV on ignition control and terminal TR on main gas valve.
Is pilot shutoff valve open?
| No |
|
| Yes | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Contact gas supplier to |
| |
| Open pilot shutoff valve. | ||||||
|
|
| correct gas pressure. |
| |||
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
Make sure pilot shutoff valve is open, 24VAC is present to pilot valve and pilot line is not kinked or obstructed. Check for clean pilot orifice. If OK, replace pilot gas valve.
Replace pilot assembly.
Is inlet gas pressure at least 5.0" W.C. and not over 14" W.C.?
No | Yes | |
|
|
|
|
|
|
Is gas present at pilot burner assembly?
Remove MV wire from ignition control. Use a match taped to a long screwdriver or pilot lighter rod and manually light pilot.
No | Yes | |
|
|
|
|
|
|
Is spark gap 0.125" and located in pilot gas stream?
No | Yes | |
|
|
|
Block any draft around boiler. Check for clean pilot orifice.
30 | Part Number |