Design Dynamics HCA-24-RFN - Manual (Page 14)

www.desatech.com 115481-01B 14
OBSERVED PROBLEM
Pilot burning, no gas to burner,
valve knob "ON", wall switch
"ON"
Frequent pilot/burner outage
problem
REMEDY
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
1. Clean and/or adjust pilot flame
for maximum flame impinge-
ment on thermocouple (see
Figure 13, page 11)
POSSIBLE CAUSE
1. Wall switch or wires
defective
2. Thermopile may not be
generating sufficient mil-
livoltage.
3. Plugged burner orifice
1. Pilot flame may be too low
or blowing (high) causing
the pilot/valve safety to drop
out
TROUBLESHOOTING
Continued