TROUBLESHOOTING SECTION
WARNING: Inspection, testing and repair of electrical equipment should only be performed by a qualified service techni- cian. Many of the tests require that the unit have power to it and live electrical components be exposed.
USE EXTREME CAUTION WHEN TESTING THE MACHINE.
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| Symptom | Possible Cause | Action |
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| Green LED flashes, but no ignition (igniter | Gas flow interrupted. | Check manual gas valve is open. |
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| sparks, no gas). |
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| Check regulated gas pressure. (7.0 |
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| WCI for natural gas or 11.0 - 14.0 WCI for |
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| propane) |
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| If gas line diameter is less than 1/2" or gas |
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| line greater than 16 feet, reduce pressure |
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| may result. |
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| Combination gas cutoff valve is closed. | Ensure 12 VDC to both sides of valve. If |
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| not, check ECO and DSI. If yes, valve may |
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| have failed shut. Replace valve. |
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| Modulating valve forced out of normal range | Tap on gas supply line between the |
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| and may be stuck (common occurrence | combination cutoff valve and the modulating |
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| during shipment). | valve. This tapping helps to free the piston. |
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| Green LED flashes, but no ignition (no | Ignition wire loose or broken. | Check wire for continuity. Check connection |
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| igniter sparks, gas flow and smell present). |
| to both the DSI and spark probe. |
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| Improper gap on spark probe. | Check height of probe above burner (should |
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| be 1/8"). Check gap between probe ends |
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| (1/8"). Ensure probe is not touching burner. |
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| Defective DSI. | Disconnect ignition wire from DSI spade |
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| connector. During ignition, a spark should |
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| be seen at this spade. If none, replace DSI. |
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| If spark exists, replace ignition wire. |
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| The unit ignites, but will not rise above | Improper operation of modulating valve. | Check voltage to modulating valve. If |
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| ignition burn. |
| greater than 2.0 VDC, modulating valve may |
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| have been forced out of its operating range. |
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| Tap on gas supply line between the |
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| combination cutoff valve and the modulating |
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| valve. This tapping helps to free the piston. |
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| If less than 2.0 VDC, replace control board. |
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