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Appendix 6: Diagnostic diagram
Problem
Excessive damage to heat exchanger
Thermal protection activated
Pump does not work
Possible cause
Too little wood or wood too moist
Condensation in heat exchanger due to
incorrect minimum return temperature
Inadequate venting of pipelines
Water pressure in installation too low
No heat is released to the heating sys-
tem
Heating system can no longer absorb
energy
No voltage
Pump does not start after prolonged idle
period
Pump shaft rotates, but does not get the
water to circulate.
Water pressure (volume flow) too low
Thermostat sensors have not reached
switching temperature yet
Subject to change because of technical improvements
Possible solution
Use wood with no more than 20% moisture. Preferably leave wood
to dry for 2 years. Use enough wood: 2 to 3 logs (2.6 kg/45 min).
Correct or repair the minimum return temperature controller.
Be sure to fit a breather valve on the highest point of the installation.
This can be a manual or an automatic valve.
Recommended water pressure is 1.5 - 2 bar. Check the pressure
setting on the expansion tank.
Check that the circulation pump is on.
Open the damper and stop stoking the fire.
Check mains voltage.
Open the vent screw on the front side of the pump and set the pump
shaft in motion with a screwdriver.
Replace the pump.
Check the pressure on the air side of the expansion tank. Top up
with water if necessary.
Flue gas temperature must be > 120°C or water temperature
> 80°C.
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