Roberts Gorden Tubular Unit Heaters 300 - Manual (Page 33)

SECTION 13: T ROUBLESHOOTING
27
SECTION 13: TROUBLESHOOTING
13.1 General
Ensure proper air flow
clearance for axial fan.
Open louvers slightly.
Replace axial fan if it does
not operate.
If problems persist, contact
Roberts-Gordon LLC at
www.rg-inc.com
Heater Operating
TROUBLESHOOT ENDS.
No
Replace limit switch.
The limit switch has
tripped. See Manual Reset
Limit Switch Figure.
No
Use Troubleshooting for
Automatic Ignition Burner
Systems section to test burner.
Has burner “Locked Out”?
Yes
No
With external controls (i.e.
thermostat) on, does the
burner continue through the
heating cycle?
No
Yes
Does the flue
blower run?
No
Use Troubleshooting for
Flue Blower section to test
fan.
Yes
Yes
Burner has locked out due
to ignition failure. Use
Troubleshooting for
Automatic Ignition Burner
Systems section to test
burner.
Is ignition control showing a
"2 flashes" led code?
Yes
No
Yes
Fan and limit switch are
operating normally.
Replace temperature
limit switch.
Wait 10-15 minutes for
limit switch to cool. Does
fan stop running?
No
Yes
Does axial fan run
immediately upon supplying
power to heater?
Yes
No
Turn on supplies.
Are gas & electrical
supplies on?
No
Yes
START
WARNING
Explosion Hazard
Installation must be done by a registered installer/
contractor qualified in the installation and service of
gas-fired heating equipment or your gas supplier.
Failure to follow these instructions can result in death,
injury or property damage.