Does the high fire |
| Is the there 24V |
| Check terminal |
| Is there 24V at the HI |
| Are the black wires |
| Replace amber light. |
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amber light come on? |
| between the |
| connections to the |
| terminal on the gas |
| to the amber light |
| Restart |
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| No | thermostat terminal | Yes | gas valve, are they | Yes | valve? | Yes | securely on the gas | Yes troubleshooting. |
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| block high fire contact |
| tight? |
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| valve terminals? |
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| and ground (yellow |
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| wire)? |
| No |
| No |
| No |
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| Repair terminal |
| Repair terminal |
| Repair connection. |
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| connections. |
| connections. Restart |
| Restart |
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| troubleshooting. |
| troubleshooting. |
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| No |
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| Remove red wire |
| Check external |
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| from the Low fire |
| thermostat wiring and |
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| terminal, is there 24V | Yes thermostat set point. |
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| at the center C |
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| terminal? |
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| No |
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| Check the red wires |
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| C should be |
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| connected to the TISS |
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| and LO connected to |
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| W (TH) module |
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Yes |
| terminal. |
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Does the low fire |
| Is the knob on the gas |
| Through the |
| See next page for |
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amber light stay on |
| valve turned to the |
| inspection window is |
| troubleshooting |
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past 10 seconds? | No ON position? | Yes | there a flame visible | No | sequence. |
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| during start up? |
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| No |
| Yes |
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| Turn on the gas |
| Does LED on the |
| Is the heater properly | Check the micro |
| Replace ignition |
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| valve? |
| ignition module flash |
| grounded? |
| Amps at the |
| module. |
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| three times? | Yes |
| Yes | terminals of the | Yes |
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| module is it greater |
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| than 0.7µA with flame. |
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| No |
| No |
| No |
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| Replace ignition |
| Correct grounding |
| Check the terminal on |
| Remove and inspect |
| Check flame sense | Contact factory for |
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| module. |
| problem. |
| the flame sense |
| flame sense |
| wire does it have | assistance. |
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| electrode, is it tight? Yes | electrode. Is it clean | Yes | continuity? | Yes | |
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| and the ceramic |
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intact?
Yes |
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With the thermostat |
| Is there 24V between | Check terminal | Is there 24V at the HI |
set to low fire only |
| the thermostat | connections, is the | terminal on the gas |
does the low fire | No | terminal block low fire Yes | yellow wire | Yes valve? |
amber light come on |
| contact and ground? | connected to the high |
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after 15 seconds? |
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| fire terminal? |
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| No | No | No |
| Adjust terminal | Repair or replace | Replace flame sense |
| connection. Restart | flame sense | wire. |
| troubleshooting. | electrode. |
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| Are the black wires | Replace amber light. |
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| to the amber light | Restart |
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Yes | securely on the gas | Yes troubleshooting. |
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| valve terminals? |
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Form #43343530 JJuly 08
Yes
Troubleshooting continued on the next page.
No | No | No | No |
Check external | Switch terminal | Repair terminal | Repair connection. |
thermostat wiring and | connections. Red wire | connections. Restart | Restart |
thermostat set point. | LO should be | troubleshooting. | troubleshooting. |
| connected to ignition |
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| module W (TH) |
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| terminal. |
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