
APPENDIX 1. DIAGNOSIS OF MALFUNCTIONS
Start
2.01. Can pilot be lit? 2.06. Pilot can be lit.
Does it stay alight?
2.08. Does main burner ignite
immediately?
2.10. Does main burner ignite
smoothly and across its/their full
length after first ignition by pilot
burner?
2.11 No proper cross lighting
of main burner.
Go to box 2.09 and take actions
act as described for 'retarded
ignition of main burner'.
No
Yes
No
Yes
Yes Yes Yes
Yes
No
No No No
2.09 Ignition procedure
– Oval knob on gas control is on
"MAN". Set to "ON" and restart.
Retarded ignition of main
burner(s)
Gas to main burner opens ca. 3-5
seconds after servo motor,
operating the gas valve, starts
running (sound of motor!). After
this the main burner is to ignite
(at least partially) within 10
seconds and not with a firm noise
WHOOF. If not: no or delayed
cross lighting of main burner.
Hazardous situation.
Stop ignition procedure straight
away and first check for:
– Position of logs or pebbles.
– Burner holes (locally) blocked.
Remove vermiculite dust.
– Vermiculite missing.
– Chips on burner.
– Vermiculite not distributed
evenly across burner(s).
2.02. Sparking?
2.03. Only one spark?
2.03a
– Loosen and retighten
earthing screw on gas
control.
– If this does not work:
replace receiver.
2.04 Check:
Receiver
- Replace missing, weak or
rechargeable batteries (not
enough power to open
thermoelectric valve).
Presence of gas on pilot burner
Check pilot on presence of gas at
normal ignition cycle or in Manual
Mode (turn oval knob on gas
control to MAN and keep safety
shut off valve opened with a
screwdriver) and ignite pilot with
a lighter.
- Pilot flame not on: Step 1.
- Pilot flame on: Step 2.
Step 1: Pilot has no gas
Check:
- Gas tap open?
- Gas at gas control (line pressure
at measuring point on gas
control).
- Gas flowing out of gas control?
(By loosening pilot tube at gas
control). If not: check adjustment
screw pilot flame (under black
cover): sealing
not to be broken.
Sealing broken: screw should be
fully open.
- Blocking of pilot tube (kink or
dirt).
- If this does not help: replace gas
control.
Step 2: Pilot has gas, but no
ignition
- Electrode with 90° bended tip:
bend tip 1 mm higher.
- Spark too weak (thin and
reddish). Act as if 'no spark' in box
2.05 and perform actions
described for ignition cable and
ignition electrode.
- Pilot flame too weak (dirty).
Remove injector (remove gland
nut and the pilot tube). See that it
does not fall away. Clean with
compressed air. Rectify. Retry.
2.07
Pilot out when servomotor starts to
run? Check the thermocouple
system.
– Measure thermocouple voltage in
mV just after servomotor starts to
run and the voltage goes down.
– Measure between red dot on
receiver and earth point on gas
control (fig. 23).
– 0 mV
– 2-3 mV
– 3-5 mV
– 6 mV and higher
– Requirement: after rectification
actions thermocouple voltage should
be 6 mV at least, just after motor
starts running!
Voltage 0 mV
– Thermocouple defective. Check by
replacing or measuring voltage at
end whilst heating (tip: with a
lighter).
– Short circuiting or interruptions in
circuit:
Check:
– thermocouple tight in interruptor;
– interruptor tight in gas control;
– black wires (yellow/red end)
connected to interruptor + receiver;
– interruptor (mount thermocouple
directly in gas control and ignite in
Manual Mode (see 2.04).
If pilot stays on: interruptor
defective.
Voltage 2-3 mV
– Check pilot flame.
Too small:
– pilot dirty.
Clean up (see 2.04).
– check for pilot gas tube tightness;
– pilot tube kinks or dirt inside;
– line pressure too low.
– Tip: thermo couple not in
(correct!) pilot flame.
Bend into flame.
Voltage 3-5 mV
– Appliance may work, but is too
critical.
Perform actions as described for
2-3 mV.
Voltage 6 mV and higher
Voltage OK, so different cause.
– Receiver defective. Check by
dismounting black-red and yellow
control cables from receiver and link
together. Ignite fire in Manual Mode
(see 2.04). Pilot stays on: receiver
defective.
– Gas control defective if receiver is
not defective. Replace gas control.
2.05 Kontrol:
Ignition cable
– Present and connected.
– Being free from metal parts or
concrete.
– Too long: cut away all excessive
length at receiver end, and
reconnect.
– Shorting out to earth: replace
ignition cable.
– Spark in wrong position:
– slide rubber sleeve on ignition
cable over ceramic of electrode.
– Replace electrode if neccessary.
Ignition electrode
– Straight electrode:
– oxidation (roughen electrode
with file or sand paper);
– position (4 mm from pilot
burner).
– Cracks in ceramic (not always
visible): replace electrode.
Starting procedure
After switching off/going out the
remote is locked for 120 sec.
(older versions 60 sec). Wait 2
minutes before reigniting.