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| there is voltage to the pilot valve, but there is no gas |
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| pressure, replace gas valve. |
| Pilot tube | Check for gas pressure at pilot tube. Disconnect pilot |
|
| tube at burner and connect manometer. If there is no |
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| gas pressure, check for blockage in pilot tube. Repair or |
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| replace as needed. |
| Pilot orifice | If there is gas pressure at the pilot tube, check the pilot |
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| orifice for damage or obstructions. Replace pilot orifice |
|
| as needed. |
Flame will not stay on | Flame sensor | To check flame sensor operation, connect a digital |
|
| multimeter (capable of measuring D.C. microamps) |
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| between the flame sensor wire and the flame sensor |
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| connection on the ignition control (terminal #13). Flame |
|
| sensor current is to be 0.7 microamps, minimum. If |
|
| these readings are not achieved, replace igniter/sensor |
|
| assembly. Also check for any type of damage to flame |
|
| sensor wire and connections. |
|
| NOTE: The D.C. microamp test must be conducted with |
|
| the oven in low flame (bypass) operation. |
| Power supply | Set the temperature to the lowest temperature setting. If |
|
| there is sufficient microamp current, but the flame will |
|
| not stay lit, check for proper polarity of the power supply. |
| Ignition control | If there is sufficient microamp current, and there is |
|
| proper polarity of the power supply, but the burner will |
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| not stay lit, check the reset button for the ignition control. |
|
| If the above test is okay, replace the ignition control. |
| NOTE: Flame should be on at |
|
| this time |
|
Low flame is on, but | Control transformer | Check for supply voltage to primary of control |
no main flame |
| transformer. If no voltage is present, trace wiring back to |
|
| oven power switch. If voltage is present, check for |
|
| 24VAC at transformer secondary. If there is primary |
|
| voltage, but no secondary voltage, replace control |
|
| transformer. |
| Oven control | Check for 24VAC supply to oven control. If no voltage is |
|
| present, trace wiring back to control transformer. Check |
|
| for supply voltage to oven control. If no voltage is |
|
| present, trace wiring back to ignition control. If voltage is |
|
| present, check for a |
|
| no |
|
| is a |
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| maximum temperature (see installation operations |
|
| manual for temperature adjustment). With the oven |
|
| control at maximum temperature, check for supply |
|
| voltage to the temperature regulation valve. If there is |
|
| voltage at the temperature regulation valve, proceed to |
|
| “Temperature regulation valve “. If there is no voltage at |
|
| the temperature regulation valve, trace wiring back to |
|
| the oven control. If there is no voltage output at the oven |
|
| control, check the |
|
| oven control reads “PROBE FAIL” this indicates that the |
|
| thermocouple has failed or become disconnected from |
|
| the oven control |
| Thermocouple | Check to see that the thermocouple is securely |
|
| connected to the oven control. If the thermocouple is |
|
| connected to the oven control, and the display indicates |
|
| “PROBE FAIL”, disconnect the thermocouple from the |
|
| oven control and measure the resistance of the |
|
| thermocouple. The thermocouple should read approx. |
|
| 11Ω. If these readings are not achieved, replace the |
|
| thermocouple. If these readings are correct, proceed. |
Impinger I – Adv Digital – Gas Service Manual – International | 9 |