Fault finding and diagrams
Greenstar Utility
ErP -
6 720 821 751 (2018/04)44
8.3.3 Flame sensing photocell
To check the correct functioning of the photocell, perform the following
actions:
▶ Electrically isolate the burner
▶ Remove the photocell
▶ Connect a voltmeter across the blue and brown wires to the photocell
▶ Reconnect the power to the burner and wait until the burner locks out
due to the false flame fault (red and green LEDs blinking)
▶ Cover the photocell to exclude any light and the voltmeter should
read 3.8 Volts or higher
▶ Expose the photocell to light and the voltmeter should read
approximately 0 Volts
▶ If these two conditions are not met, change the photocell
▶ Disconnect the voltmeter
▶ Disconnect the burner and replace the photocell
6 Pump washing pressure 1 to 2 bar? Yes Go to line 7
No Go to line 6a
6a Pump pressure more than 6 bar? Yes Replace oil pump
No
Go to line 6b
6b
Check oil supply to the pump, if oil supply is OK Go to line 6c
6c
Drive coupling broken? Yes Replace drive coupling
No Replace oil pump
7 Ignition spark present? Yes Go to line 8
No Go to line 7a
7a Are ignition leads and electrodes OK and set correctly? Yes Replace control box
No Replace/reset electrodes/ignition leads
8 Solenoid coil releases working pressure? Yes Go to line 9
No Go to line 8a
8a Does burner light or green 0.5 seconds ON/red 0.5 seconds ON
before lockout?
Yes Go to line 5a
No
Go to line 8b
8b
Contaminated fuel filters? Yes Clean/Replace filters
No
Go to line 8c
8c
Coil lead OK Yes Go to line 8d
No
Replace solenoid coil lead
8d
Solenoid coil resistance 90 to 110 Ω Yes Go to line 8e
No
Replace solenoid coil
8e
After 15 seconds from motor start, 25 to 30 Volts d.c. to solenoid
coil? (coil connected)
Yes Replace oil pump
No
Replace control box
9 Air set correctly? Yes Go to line 10
No
Adjust combustion air settings
10 Does the burner light?
Flue damper fitted? (if required)
Yes Go to line 11
No
Go to line 10a
10a
Is the nozzle atomising the fuel? Yes Go to line 11
No
Go to line 10b
10b
Nozzle new? Yes Go to line 10c
No
Replace nozzle
10c
Check oil pipe from pump to nozzle holder Clean/ replace pump and fuel line filters
11 Combustion head set correctly? Yes Go to line 11a
No
Reset combustion head
11a
Flame goes out then re-lights Yes Go to line 11c
No
Go to line 11b
11b
Boiler or flue blocked Yes Clear blockage
No
Go to line 11c
11c
If balanced flue, remove the snorkel and test - now OK? Yes Go to line 11d
No
Go to line 11e
11d
Balanced flues can recirculate gases causing recycling Check the air intake with an analyser for the presence of re-
circulating flue gases (CO
2
and CO), if any re-circulation is
present, check the flue position and seals
11e
Photo cell voltage ≥ 3.8V in the dark and
approximately 0V in the light?
Yes Replace the control box
No Replace photocell
Line Check Action
Table 22
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