Desa HCA-24-RFN, HCA-18-RFN, HCA-18-RFP, HCA-24-RFP Problem Or blowing high causing, Out

Models: HCA-24-RFP HCA-18-RFN HCA-24-RFN HCA-18-RFP

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TROUBLESHOOTING

Continued

OBSERVED PROBLEM POSSIBLE CAUSE

REMEDY

Pilot burning, no gas to burner, valve knob "ON", wall switch "ON"

1.Wall switch or wires defective

2.Thermopile may not be generating sufficient mil- livoltage.

3.Plugged burner orifice

1.Check wall switch and wires for proper connections. Jump- er wire across terminals at wall switch. If burner comes on, replace defective wall switch. If okay, jumper wires across wall switch wires at valve. If burner comes on, wires are faulty or connections are bad

2.Check thermopile with mil- livolt meter. Take reading at thermopile terminals of gas valve. It should read 325 mil- livolts minimum with optional wall switch "OFF". Replace faulty thermopile if reading is below specified minimum.

3.Check burner orifice for stop- page and remove

Frequent pilot/burner outage

1. Pilot flame may be too low

problem

or blowing (high) causing

 

the pilot/valve safety to drop

 

out

1.Clean and/or adjust pilot flame for maximum flame impinge- ment on thermocouple (see Figure 13, page 11)

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www.desatech.com

115481-01A

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Desa HCA-24-RFN, HCA-18-RFN, HCA-18-RFP, HCA-24-RFP installation manual Problem Or blowing high causing, Out