Buderus Logamax plus GB162-80 kW Service Instructions Manual page 54

6 Diagnosis
section 64
Step 11 Diagnosis: The three-way valve has not been installed correctly.
Action: Install the three-way valve correctly.
Step 12  Check that the three-way valve is being activated.
Step 13 Is the three-way valve activated?
Step 14 Diagnosis: The servomotor of the three-way valve is defective.
Action: Replace the servomotor of the three-way valve.
Step 15  Check the wiring of the three-way valve.
Step 16 Is the wiring of the three-way valve okay?
Step 17 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part.
Step 18  Check the interior of the three-way valve for contamination and/or damage.
Step 19 Is the three-way valve okay?
Step 20 Diagnosis: The three-way valve is defective. Action: Replace the three-way valve.
section 65
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Step 1  Check the plug-and-socket connection of the pressure sensor. See section 1, [30].
Step 2 Is the plug-and-socket connection okay?
Step 3 Diagnosis: The plug-and-socket connection has come loose. Action: Renew the plug-and-socket connection.
Step 4  Check the wiring between the pressure sensor plug and the UBA 3 mounting base by measuring the electrical
resistance, see section 131.
Step 5 Is the wiring okay?
Step 6 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part.
Step 7  Use another pressure gauge than the pressure gauge on the control panel to check whether the heating system
water pressure measured at the height of the boiler is too high and is more than 83 PSI.
Step 8 Is the water pressure of the heating system too high?
Step 9 Diagnosis: The water pressure of the heating system is too high.
Action: Drain the heating system until the water pressure is approx. 22 PSI.
Step 10 Diagnosis: The pressure sensor is defective. Action: Replace the pressure sensor, see section 128.
Step 11 Has the fault been remedied?
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Locking fault code: The pressure sensor contacts (section 1, [30]) are open.
Locking fault code: The pressure sensor contacts (section 1, [30]) have shorted.
Blocking fault code: The water pressure indication does not work properly.
Operating code: The water pressure of the heating system is beyond the measuring
range of the pressure sensor (section 1, [30]).
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
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