Buderus Logamax plus GB162-80 kW Service Instructions Manual page 34

6 Diagnosis
section 33 (continued)
Step 5 Does the LED "Central heat demand" light up?
Step 6  Check the ON/OFF controller according to section 114 or the RC regulator according to section 115.
Step 7 Does the boiler start heating operation within approx. 3 minutes
Step 8 Diagnosis: The thermostat cable is defective. Action: Replace thermostat cable.
Step 9 Diagnosis: The ON/OFF controller, the RC regulator or the RCC module, if present, is defective.
Action: Replace ON/OFF controller, RC regulator or RCC module. The RCC module is a suspended connection
tray, required for certain RC regulators.
Step 10 Has the fault been remedied?
Step 11  Check that the heating system supply temperature on the BC10 or on the RC regulator or ON/OFF controller has
been set high enough as instructed in section 81 or in the operating instructions of the regulator or controller.
Step 12 Is the heating-system supply temperature adjusted to a high enough setting?
Step 13 Are enough thermostatic valves open on the radiators, convectors, etc?
Step 14 Diagnosis: There are not enough thermostatic valves open on the radiators, convectors etc.
Action: Open more thermostatic valves.
Step 15 Diagnosis: The heating system supply temperature setting is too low. Action: Increase the heating system
supply temperature setting on the BC10 or on the RC regulator or ON/OFF controller as instructed in section 81 or
in the operating instructions of the regulator or controller.
Step 16  Check that the boiler performance has been set correctly in accordance with section 23 and 133.
Step 17 Is the boiler performance setting high enough?
Step 18 Diagnosis: The boiler performance setting is too low. Action: Adjust the boiler performance to a higher setting,
see section 23 and 133.
Step 19 Is the boiler performance of the wall-mounted condensing gas boiler sufficient to heat the building?
Step 20 Diagnosis: The boiler performance is too insufficient. Action: Install a larger heating boiler.
Step 21 Is there a hot-water supply?
Step 22  Check the movement of the servomotor of the three-way valve.
Step 23 Does the servomotor of the three-way valve move?
Step 24  Check that the three-way valve has been installed correctly.
Step 25 Has the three-way valve been installed correctly?
Step 26 Diagnosis: The three-way valve has not been installed correctly. Action: Install the three-way valve in the
correct way.
Step 27  Check the three-way valve activation.
Step 28 Does the activation of the three-way valve work correctly?
Step 29 Diagnosis: The servomotor of the three-way valve is defective. Action: Replace the servomotor of the three-
way valve.
34 Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
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