Tuttnauer 2540 EHS, Technician Manual

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92
Corrections
10.3.1
Reset or replace the Cut-Off thermostat.
10.3.2
make sure the water pump is working.
Make sure that the wires are connected to the electrodes. Check electrode assembly sec 9.16.
10.3.3
Replace the DIG-T2 board
10.3.4
If the Pressure Switch is open replace it
(
DO NOT
attempt to adjust this device).
10.3.5
Check the SSR (see symptom 34).
10.3.6
If all the preceding tests are good then
replace the ANL-T2 board
10.4.1
Reset the cut-off thermostat. If it does not
help – replace it.
10.5.1
Reset the cut-off thermostat. If it does
not
10.5.2 Fix
connection.
10.5.3
Replace faulty contactor.
11.1
Replace the DIG-T2 board.
11.2
With the JP1 removed if the pump
continues to run then replace the AC-T1 board. If the pump stops then replace the ANL-T2
Possible cause check-up and tests
10.3
If no voltage is seen at the terminal block then check if the Cut-Off thermostat is open. If the voltage at TP4 is always <1VDC then check if the electrodes are sensing water in the jacket. If they are, then the problem is the DIG-T2 board. If the voltage at TP4 is higher than 4VDC the problem could be with either the ANL-T2, the SSR, the pressure switch or the Cut-Off thermostat.
10.4
On model 2540 only:
10.4.1
Cut-off thermostat disconnects the heating element.
10.5
On model 3870 only:
10.5.1
Cut-off thermostat disconnects command to the contactor that disconnects the heating element.
10.5.2
The contactor is disconnected.
10.5.3 Faulty
contactor.
The problem may be a failure of the control
circuit on the DIG-T2 board or the driver on the AC-T1 board.
11.1
Check TP5. If the voltage is higher than 4V then the DIG-T2 board is faulty.
11.2
If the voltage at TP5 is <1VDC the problem is either the AC-T1 board or the ANL-T2 board. Turn off the power and remove the JP1 connector on the AC-T1, turn the power back on.
10. TROUBLESHOOTING
(cont.)
10.4
In Process Malfunction
(cont.)
Symptom
10.
Heating elements will not heat the jacket, but the display is on. (cont)
11.
The vacuum pump works continuously