45
Henrad SE FF
- Installation
80 FAULT FINDING CHART 2 - Burner Pressure Incorrect or Zero
FAULT FINDING
Notes.
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1. The burner pressure is regulated by the gas valve, according to the air flow generated by the fan, and on
cold ignition should be slightly higher than the value quoted on the Data badge.
2. Equilibrium fan pressures should be as follows: (± 0.2 mbar) with 300mm flue length
NO
Boiler
Pressure mbar
SE 30 FF
1.7
SE 40 FF
1.9
Boiler
Pressure mbar
SE 50 FF
1.7
SE 60 FF
2.0
Boiler
Pressure mbar
SE 70 FF
1.1
SE 80 FF
1.9
Is the appliance gas cock fully open ?
Contact the
gas supplier
YES
YES
Determine the cause of pressure loss
(e.g. supply pipe too small ?) and rectify
Is the supply pressure
correct at the gas meter ?
YES
Are air and flue ducts free from blockage ?
Clear blockage and take steps to prevent recurrence
NO
YES
Rectify fault and take steps to prevent recurrence
NO
Are the fan and low pressure sensing pipes correctly
connected, free from damage and unobstructed by
solid matter or moisture ?
Change lead assembly
Check gas valve by substitution
Check for blocked air duct
Check the connections at
the pressure switch.
(wires on 1
and 3) - if OK change the
pressure switch
NO
YES
YES - but only
with the boiler
sealing panel
removed
Is there live on the connector in the control box, which
joins the red lead from the dry fire 'stat to the brown
lead from the gas valve,
during an ignition trial period
?
Remove connectors. With mains OFF, check continuity of
leads from each socket unit back to the corresponding
terminals in the control box. Are leads in good order ?
YES
Can the 'stat be reset when the boiler is cold ?
YES
Has the dry fire thermostat tripped ?
NO
Reset 'stat. Check boiler is
full of water.
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Is there continuity between the terminals of the
dry fire 'stat ?
Are both connectors correctly fitted to the gas valve ?
Has the flue thermostat tripped ?
Can the 'stat be reset when the boiler is cold ?
NO
YES
Is there continuity between the terminals of the
flue 'stat ?
To check the pressure connect an inclined gauge manometer to test points (G) and (I). Refer to Frame 47
YES
NO
Is there live on the red lead of the gas valve connector
on
Board 37
during an ignition trial period
?
YES
NO
YES
Check
Board 37
by substitution.
NO
YES
YES
NO
NO
YES
NO
YES
NO
Replace the flue 'stat.
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Reset 'stat.
Check boiler is full of water.
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Replace the dry fire 'stat.
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F
AUL
T FINDING
Is the gas supply pressure adequate at the
appliance inlet during an ignition attempt
Summary of Contents for Henrad SE 30 FF
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