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UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
28
13.2 Troubleshooting For Automatic Ignition Burner Systems
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Heater Operating
TROUBLESHOOT ENDS.
No
Trace fault in supervision
system. See
Troubleshooting
for Flame Supervision
System section.
Yes
Is ignition control showing
a "2 flashes" led code?
No
Is the flame current at
least 1 μAmp DC when
the flame ignites?
Ignition control faulty;
replace.
See Ignition Control section.
Is ignition lead okay and
connected?
Is spark electrode okay?
Yes
Replace valve.
Is the gas valve operating?
To test valve, See
Troubleshooting for Gas
Valves section.
No
Does the flame light?
No
Yes
Wait 30 - 40 seconds.
Does ignition spark
No
Yes
Flue blower faulty;
replace
Burner control faulty or wiring
connections faulty. Repair
or replace as necessary
Check for too much vent/air inlet duct. Check for blockage in
vent and combustion air circuit. Check for faulty air pressure
switch. Check pressure switch hoses for leaks or cracks.
Do not attempt to circumvent pressure switch circuit to
place unit in operation.See Pressure Switch section for details.
Does air pressure switch
change over?
No
Yes
Turn on controls.
Is 120 V supply at fan
connections?
Does flue blower run?
No
Are external controls
(i.e. Thermostat) on?
No
Yes
Yes
Is ignition control showing
a "4 flashes" led code?
No
Yes
Press in reset button on
manual reset limit switch
Turn on supplies.
Are gas & electrical
supplies on?
Yes
START
No
Yes
No
Yes
WARNING
Electrical Shock Hazard
Do not touch ignition components.
Voltage from ignition components is high.
Failure to follow these instructions can
result in death or electrical shock.
For your safety and optimum heater performance,
use only replacement parts sold and supplied by
Roberts-Gordon.
Conduct start-up procedure as shown on Page
19, Section 10.