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 fan 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. |
Press in reset button on | Failure to follow these instructions can |
result in death or electrical shock. | |
manual reset limit switch |
|
Is 120 V supply at fan | Yes | Flue fan faulty; replace | |
connections? | |||
|
|
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 operate? | ||
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
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 ROBERTS GORDON® replacement parts.
Conduct
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