COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

13.2 Troubleshooting For Automatic Ignition Burner Systems

START

Are gas & electrical

No

supplies on?

 

Yes

 

Are external controls

No

(i.e. Thermostat) on?

 

Yes

Is ignition control showing Yes

a "4 flashes" led code?

 

No

 

Does flue blower run?

No

 

Yes

 

Does air pressure switch

No

change over?

 

Yes

 

WARNING

Turn on supplies.

Turn on controls.

Electrical Shock Hazard

 

 

Do not touch ignition components.

 

Voltage from ignition components is high.

 

Failure to follow these instructions can

Press in reset button on

result in death or electrical shock.

manual reset limit switch

 

 

Is 120 V supply at fan

Yes

Flue blower faulty;

connections?

replace

 

No

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.

Wait 30 - 40 seconds.

No

Does ignition spark

 

Yes

 

Does the flame light?

No

Yes

 

Is ignition control showing

Yes

a "2 flashes" led code?

 

No

Heater Operating

TROUBLESHOOT ENDS. No

Is ignition lead okay and

connected? Yes Is spark electrode okay?

Is the gas valve operating?

To test valve, See No Troubleshooting for Gas

Valves section.

Is the flame current at

least 1 μAmp DC when Yes the flame ignites?

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Ignition control faulty; replace.

See Ignition Control section.

Replace valve.

Trace fault in supervision

system. See

Troubleshooting

for Flame Supervision

System section.

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.

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Roberts Gorden 225 250, 200, 350 Troubleshooting For Automatic Ignition Burner Systems, Result in death or electrical shock

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