OM-HH
17
System does not produce a spark Auth
Service
Rep Only
a. Thermostat: close the contacts if they are open Y
b. AC voltage between terminals “2" and “GR.” If it is not
24 Volt, replace the transformer Y
c. That the jumper is securely connected between
terminals “5" & “GR.”
d. That the high tension cable is firmly attached and in
good condition. If cracked or brittle, replace the
pilot.Y
e. Pilot electric ceramic for crack or break.Y
f. Pilot spark gap. Regap, if it is not 7/64 inch.Y
g. Replace the electronic portion of the G770 system.Y
Spark is present but the pilot will not
light.
Auth
Service
Rep Only
a. That the pilot valve is connected to terminals “1" and
“GR.” (Some models are grounded internally).Y
b. For 24 VAC at terminals “1" and “GR.” If 24V is not
present, replace the ignition control.Y
b. That pressure meets manufacturer specifications.Y
c. For gas at the pilot. If it is not flowing:
(1) Check pilot gas line for kinks or obstructions.Y
(2) Clean orifice, if necessary.Y
(3) Replace the pilot valve.Y
d. That the pilot spark gap is 7/64 inch and located in the
pilot gas stream. If not, adjust or replace the pilot.Y
e. For drafts. Shield the pilot burner, if necessary.Y
Pilot lights, but main burner will not
come on and spark does not stay
on.
Auth
Service
Rep Only
a. For 24 V between terminals “3" and “GR”. If voltage is
not correct, replace the ignition control.Y
b. That the gas pressure meets the control
manufacturer’s specifications.Y
c. Electrical connections of the main valve to terminals
“3" and “GR”, to assure that they are securely
attached. If they are, replace the main valve.”Y
Pilot lights, but main burner will not
come on, the spark stays on.
Auth
Service
Rep Only
a. That sensor cable and high voltage cable are
separated from one another and not wrapped around
a pipe or accessory.Y
b. Sensor cable, to make certain that there are secure
attachments to terminal “4" and the sensor.Y
c. Sensor ceramic for cracks.Y
d. That cable is not grounded out. If it is, correct the
ground.Y
e. That the sensor or its connector is not grounded out.Y
f. Sensor cable for continuity and condition of
insulation.Y
g. Disconnect main valve lead from terminal “3," and
sensor cable from terminal “4.” Observing correct
polarity, connect a DC micro ammeter between the
sensor cable terminal and terminal “4.” Check that the
current is 0.15 microamp or greater with only the pilot
operating. If it is, replace the ignition control.Y
h. For proper gas pressure.Y
i. Clean pilot assembly, if necessary.Y
j. Tighten all mechanical and electrical connections.Y
k. Pilot application, and correct to increase sensor probe
current, by:
(1) Increasing or decreasing pilot orifice size.Y
(2) Shielding the pilot from drafts.Y
l. Replace sensor or orifice.Y
m. Replace ignition control.Y
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