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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.
TROUBLESHOOTING SECTION
17
Possible Cause Action
Gas flow interrupted. Check manual gas valve is open.
Check regulated gas pressure. (7.0 -10.5
WCI for natural gas or 11.0 - 14.0 WCI for
propane)
If gas line diameter is less than 1/2" or gas
line greater than 16 feet, 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
and may be stuck (common occurrence
during shipment).
Tap on gas supply line between the
combination cutoff valve and the modulating
valve. This tapping helps to free the piston.
Ignition wire loose or broken.
Check wire for continuity. Check connection
to both the DSI and spark probe.
Improper gap on spark probe.
Check height of probe above burner (should
be 1/8"). Check gap between probe ends
(1/8"). 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.
Improper operation of modulating valve. Check voltage to modulating valve. If
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.
Symptom
Green LED flashes, but no ignition (igniter
sparks, no gas).
The unit ignites, but will not rise above
ignition burn.
Green LED flashes, but no ignition (no
igniter sparks, gas flow and smell present).