Technical data

GUH RANGE PROPANE GAS FIRED UNIT HEATERS
Page 29 of 41
Fig 22
Fig 23
Fig 24
No
Operation
Check that Limit
Stat is not in Fail
Safe Position
Check Stat
Check
Timer
Check External
Controls are
Demanding Heat
Check there is
power to the
Heater
Check Fuse
Pilot Will
Not Light
No Spark
Air in Gas
Supply
Pilot Line
Restricted
No Gas
Supply
Check Electrode
Gap is Correct
Purge System to
Remove Air
Check that Pilot
Adjuster is set
Correctly
Check Gas taps
are open and Gas
is Present
Check Electrode
is not Cracked
Check HT leads
and Connectors
Check Spark
Generator
Check Control
Box
Replace Faulty
Unit
Pilot lights
but fails to
become
Established
Poor Signal
from Probe
Check
Flame Path
Check Probe
Signal
Faulty
Control Box
Pilot Flame
to Small
Replace
Faulty Probe
Replace
Faulty Unit
Check Pilot
Flame Adjuster
is Fully Open
and Pilot Feed is
Unrestricted