Troubleshooting and repair should only be attempted by qualified personnel;
Review Safety Warnings Page for more complete details of potential hazards
Inside the enclosure there are lethal AC voltages, 15VDC power at 12 amps, as well as exposed rotating fan blades and other potentially hazardous components.
ALWAYS USE CAUTION! DEENERGIZE EQUIPMENT PRIOR TO ATTEMPING SERVICE!
The status board will indicate what the on-board computer thinks is happening.
Verify that the unit has commanded the response before going in to verifying hardware. For example, verify the board indicates that the pump relay is closed before physically pulling the relay.
Troubleshooting Peltier elements can be difficult at the part level without specialized equipment. A conventional Ohm Meter will not provide useful information. Peltier failure or degradation can be indicated by
current measurement. The measurement should be made during the first few minutes of start-up. For a 20410D, the Peltier elements are wired in parallel, with each drawing between 6 and 9 amps. Unit-to-unit variation, such as exact voltage, wire run length, ambient temperature, and cooler temperature, can generate some variation. This test can also be performed by placing a DC inductive ammeter around the black or white leads coming off JP10 or JP11.
12VDC Cooling Fan
There are two regulated outputs for the 12VDC cooling fans, one is thermostatically controlled by the control board for enclosure component cooling. The 12VDC cooling fans on a 20410D should be wired to the designated 12VDC output of the board. Care should always be taken to avoid rotating blades!
|No LED(s) and no fan.||AC power input. |
10A DC fuse on Control Board
15A AC Input fuse on Power Supply
Verify 15VDC at output terminals on Power Supply
|Ensure that AC power is connected. Replace fuse as necessary. |
Replace fuse as necessary.
|LED(s) on and heatsink fan does not run.||Check fan for blockage (power off). Check for power at JP1 (AC power input, unfused), JP2 (AC power for fan, fused) on control board |
Verify voltage at terminal JP2 of control PCB; Should be line voltage
|Clear any blockage, replace fuse or repair wiring as required |
|F1 on control PCB keeps blowing.||Disconnect JP2 wiring for heat sink fan; Replace fuse||Energize cooler and see if fuse blows- |
|Failure LED is on.||Thermistor connection JP15 pins 1-4||Ensure proper connection. |
Try a good thermistor in place of old
|Impinger frozen and cooler indicates ambient temperature.||Thermistor placement in heat exchanger block. |
Peltier element wiring
|Verify placement of thermistor |
|Impinger does not reach set temperature, but is below ready temperature.||System loading. |
Verify Peltier Element current draw
|Ensure system loading is not exceeding cooler capacity. |
Peltier Elements should draw between 6 and 9 Amps
|Ready LED does not come on when impinger is below 10°C.||Ready temperature adjustment.||Consult Factory|
|Water carryover in system.||Impinger temperature. Should be below 5°C.||Ensure system loading is not exceeding cooler capacity and ambient conditions are not exceeding specifications.|
|Slip LED does not come on.||Water carryover in system. |
Water slip sensor connections.
|Ensure system loading is not exceeding cooler capacity and ambient conditions are not exceeding specifications. |
|Pump does not start. Ready and slip LED(s) are on.||Pump electrical connections.||Ensure proper connections. |
Possible defective pump; Measure voltage at corresponding pump terminals.
Possible defective relay coil or relay contact- Visually check operation and condition. If O.K., check coil of relay with ohm meter; if O.K., possible bad relay contact; Replace with known good relay.
Download Baldwin™-Series Model 20410D Thermo-Electric Cooler User’s Manual