SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS
Page 28
TROUBLE-SHOOTING FLOW CHART FOR HONEYWELL
OR UTC IGNITION MODULE (24V CONTROL SYSTEM)
Manifold pressure in proper
range (3.5”-4.2” N.G.,
10”-11” L.P.). If no pressure on
manifold, during main flame
trial for ignition period, check
for pressure at tappings of each
main valve. Replace valve
that shows no pressure at
downstream tapping while
powered with pressure at
upstream tapping.
24V at terminals of
all valves in main
gas train
Check for loose or
broken wire between
main valves and
MV-MV/PV terminals.
Replace
module.
With pilot lit: 24V
between the MV and
MV/PV terminals of
the module
Replace the pilot
assembly.
Replace pilot solenoid
valve.
Main Flame
Ignites
Insure pilot line and
pilot orifice are clear
and that the pilot is
undamaged. The pilot
ignites.
Pilot valve opens.
Confirm that gas is
present at pilot valve
inlet.
Check for loose or
broken wire between
pilot valve and
PV-MV/PV terminals.
24V at pilot gas
valve leads
Replace
module.
Adjust the pilot gas
pressure using the
pilot regulator. Pilot
ignition problems
can be caused by
high or low pilot
pressure.
Pilot ignites
During pilot ignition period (audible spark present) check
for 24V between PV and MV/PV terminals of module.
Check for loose or broken ignition lead. Check for shorted pilot electrode.
If pilot and ignition lead test good replace module.
A tripped manual reset
high limit may
indicate insufficient
water flow.
Check for open limit in this 24V circuit
operating control, high limit, flow switch,
LWCO, high / low gas pressure switches,
remote operating controls, etc.
Check for broken or loose
connection to transformer, if none
replace transformer.
Check for tripped breaker or open safety
/ limit switch in supply voltage circuit.
Proper line voltage
L1 to L2 on heater
terminal strip
24V on secondary
terminals of heater
transformer
24V across 24V and 24V
(GND) terminals of
ignition module
On application of 24V,
control produces audible
spark at pilot
Pilot
Ignites