Combat HVAC ELU 100, Installation And Commissioning Manual, Page: 40 / 52

Unit Heater Installation, Commissioning, Operation and Service Manual
35 36
Combat Elite Unit Heater EL231117 Orig
Start
Are gas and electrical
supplies on?
Is red lockout light on?
Does the flue fan run?
Heater Operating
TROUBLESHOOT ENDS
Does air pressure switch
change over?
Is 230 V supply at fan
connections
Wait 30-40 seconds. Is
ignition spark operating?
Is HT lead OK and connected
is spark electrode ok?
If problems persist, contact
Combat HVAC Limited at
tel: +44(0)121 506 7709
Has the thermostat limit
thermodisc operated or light
faulty? Reset or replace as
necessary
Press in lockout reset
buttonon rearof heater or
remote reset button if needed
Flue fan faulty replace
Check for too much flue/air
inlet duct. Check for blockage
in combustion air circuit.
Check for faulty air pressure
switch.
Is the gas valve operating?
To test valve see Section
Turn on supplies
Burner control faulty or plug
in connections faulty. Repair
or replace as necessary
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Does the flame light?
Is red lockout light on?
Ignition control faulty, replace.
Is the flame current at least 1
µAmp DC when the flame lights
Replace valve.
Trace fault in supervision system
see section 16.3
Is the green light on? Are external controls on?
No
To measure flame current, connect a 0-50 µA DC meter in
series with the flame probe. If the meter reads negative values,
then reverse the test leads.
16.2 Troubleshooting for Automatic Ignition Burners SECTION 16