Error 26.07: Water shortage fuse activated
LambdaControl 1
Error 26.07
Water shortage
Do not fire!
Cause: Water shortage fuse activated, input at approx. +12VAC
Display 3 red: illuminates
Information text: Check water level.
Emergency program: NO
Reset: Automatically after error correction
Error detection: The controller checks voltage of <1V= at the 16-pin plug (KL1).
User intervention: Check water level and system pressure, contact technician if both are OK.
Technician – possible causes:
Test – system w/o water shortage fuse:
1. Place a bridge between KL1 – 2 of plug ST9. If that does not help, continue with test 2.
2. Remove the 16-pin plug from the controller; check the resistance between 16-pin plug (KL1) and plug ST9 (KL1). If it is
<1Ω, the system has a wiring error, or the controller is defective.
Test – system with water shortage fuse:
Place a bridge instead of the water shortage fuse in KL1 – 2 of plug ST9. If this rectifies the error, the water shortage fuse
is defective; otherwise check point 2 above.
Experience shows that the controller is usually only defective, if faulty wiring or spurious actions damaged the applicable
input/output.
Controller function: “Boiler OFF” / V1 = 0% / V2 = scavenging air. All 230 V outputs are deactivated independently from the
controller software.
Error 26.08: STB triggered
LambdaControl 1
Error 26.08
STB triggered
Boiler temp. ---.-°C
Cause: Overtemperature (boiler temperature ≥ 95°C)
Display 3 red: illuminates
Information text: Unscrew STB-cap, press button less than 86°C
Emergency program: NO
Reset: Press STB reset button. Remove cap – press button, screw cap back on
Error detection: Controller measures a temperature of >97.5°C ± 2.5K at sensor input ST3 (KL1 – 2).
User intervention: Reset STB (quit) at a boiler temperature of <86°C. If the STB cannot be reset, call a technician.
If the error occurs repeatedly, call a service technician.
Technician – possible causes:
1. Test – are plug ST3 and the 15-pin plug properly connected with the controller and is the sensor connected
correctly? Is that the case, continue with test 2.
2. Test – of combined boiler and STB temperature sensor: Remove plug ST3, at plug ST3 (KL1 – 2) there should be a
resistance of 2155.9Ω at 20°C and a resistance of 2770.1Ω at 100°C. Is that the case, continue with test 3.
3. Test – wiring harness: Remove 15-pin plug from the controller, check for a resistance of <1Ω between the 15-pin plug (KL8)
and the plug ST3 (KL2); check for a resistance of <1Ω between the 15-pin plug (KL9) and plug ST3 (KL1). Is that not the case,
the system has a wiring error or the controller is defective.
Experience shows that the controller is usually only defective, if faulty wiring or spurious actions damaged the applicable
input/output.
Controller function: “Boiler OFF” / Flue gas fan switched off by controller and STB. For Wood boiler with burner: the controller
and STB switch off the burner.
Air flap position: V1 = 0% / V2 ≥ scavenging air.
Boiler temperature higher than 85°: Y1 and Y2 - OPEN / load pump M1 ON.
Boiler temperature less than 84.5°: Residual heat use via RWO.
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