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.
|
|
|
|
|
| Symptom | Possible Cause | Action |
|
|
|
|
|
|
| Green LED flashes, but no ignition (igniter | Gas flow interrupted. | Check manual gas valve is open. |
|
| sparks, no gas). |
|
|
|
|
|
|
|
|
|
|
| Check regulated gas pressure. (4.0 |
|
|
|
| WCI) for town gas. |
|
|
|
|
|
|
|
|
| If gas line diameter is less than 1/2" |
|
|
|
| (1.27cm) or gas line greater than 16 feet |
|
|
|
| (4.88m), reduce pressure may result. |
|
|
|
|
|
|
|
| Combination gas cutoff valve is closed. | Ensure 12 VDC to both sides of valve. If |
|
|
|
| not, check ECO and DSI. If yes, valve may |
|
|
|
| have failed shut. Replace valve. |
|
|
|
|
|
|
|
| Modulating valve forced out of normal range | Tap on gas supply line between the |
|
|
| and may be stuck (common occurrence | combination cutoff valve and the |
|
|
| during shipment). | modulating valve. This tapping helps to |
|
|
|
| free the piston. |
|
|
|
|
|
|
| Green LED flashes, but no ignition (no | Ignition wire loose or broken. | Check wire for continuity. Check |
|
| igniter sparks, gas flow and smell present). |
| connection to both the DSI and spark |
|
|
|
| probe. |
|
|
|
|
|
|
|
| Improper gap on spark probe. | Check height of probe above burner (should |
|
|
|
| be 1/8"(.318 CM)). Check gap between |
|
|
|
| probe ends (1/8"(.318 CM)). Ensure probe |
|
|
|
| is not touching burner. |
|
|
|
|
|
|
|
| Defective DSI. | Disconnect ignition wire from DSI spade |
|
|
|
| connector. During ignition, a spark should |
|
|
|
| be seen at this spade. If none, replace DSI. |
|
|
|
| If spark exists, replace ignition wire. |
|
|
|
|
|
|
| The unit ignites, but will not rise above | Improper operation of modulating valve. | Check voltage to modulating valve. If |
|
| ignition burn. |
| greater than 2.0 VDC, modulating valve |
|
|
|
| may have been forced out of its operating |
|
|
|
| range. Tap on gas supply line between the |
|
|
|
| combination cutoff valve and the |
|
|
|
| modulating valve. This tapping helps to free |
|
|
|
| the piston. If less than 2.0 VDC, replace |
|
|
|
| control board. |
|
|
|
|
|
|
17
