TROUBLESHOOTING
Note: In normal operation, LED blinks once every two seconds; also, LED will be on for one second after every valid command received by the receiver/valve' these are not error codes.
Failure codes can occur anytime after the pilot burner is lit. Failure code timing is 1/4 second on, 1/2 second off.
Sequence is failure code followed by LED not blinking for four seconds.
In the event of multiple failure codes, the next failure code follows the previous failure code by approximately 3 seconds.
LED Failure Code |
|
(No. of Blinks) | Service Action |
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8 | Replace valve. |
|
|
7 | Confirm stepper motor |
| connection exists. |
|
|
5 | Confirm fan connection |
| exists and works. |
|
|
3 | Replace thermopiles. |
|
|
2 | Devicetoohot.Turnonfan |
| orifapplicable,openglass |
| doors. |
1 short blink | Normal operation |
|
|
LED Failure Codes and Service Action
WARNING:Turnoffandunplugheaterandletcoolbeforeservicing. Only a qualified service person should service and repair heater.
IMPORTANT: Valve system troubleshooting should only be accom- plished by a qualified service technician.
Note: Before troubleshooting the gas control system, be sure external gas shut off valve (located at gas supply inlet) is in the "ON" position.
OBSERVED PROBLEM POSSIBLE CAUSE | REMEDY |
|
|
Spark ignitor will not light pilot after repeated triggering of ig- nitor button
1.Defective ignitor (no spark at electrode)
2.Defective or misaligned electrode at pilot (spark at electrode)
3.Gas supply pressure errant
4.Pilot orifice plugged
1.Check for spark at electrode and pilot; if no spark and electrode wire is properly connected, replace ignitor
2.Using a match, light pilot. If pilot lights, turn off pilot and trigger the ignitor button again. If pilot lights, an improper gas mixture caused the bad lighting and a longer purge period is recommended. If pilot will not light, check gap at electrode and pilot - gap should be 1/8" to have a strong spark. If gap measures 1/8", replace pilot
3.Check inlet gas pressure. It should be within the limits as marked on the rating plate
4.Clean or replace pilot orifice
Pilot will not stay lit after care- | 1. Defective pilot generator | 1. Check pilot flame, it must |
fully following the lighting | (thermocouple) | impinge on thermocouple |
instructions |
| (see Figure 13, page 11). |
|
| Clean and/or adjust pilot for |
|
| maximum flame impingement |
|
| on thermocouple. Ensure that |
|
| the connection between the |
|
| valve and thermocouple are |
|
| tight and secure. |
www.desatech.com | 13 |
