Covidien WarmTouch, Service Manual

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Basic Troubleshooting
Service Manual 6-11
Heater not operating
•
Check the error codes on the System Information screen
(
page 1-9 ), and perform recommended corrective actions
( page B-1 ).
•
Check the heater cable connection to the power PCBA
(
page 10-31 ).
•
Try replacing components in the following order:
1. Heater (
page 11-43 ).
2. Power PCBA ( page 10-31 ).
Thermostat test failure
(thermostat fails to open)
•
Check the error codes on the System Information screen
(
page 1-9 ), and perform recommended corrective actions
( page B-1 ).
•
Check the thermostat cable connection to the power PCBA and
to the thermostat terminals (
page 11-14 ).
•
Try replacing components in the following order:
1. Thermostat (
page 11-9 ).
2. Power PCBA ( page 10-31 ).
3. Thermostat cable ( page 11-14 ).
Temperature accuracy test
failure
(output air temperature not
within specification)
•
Check the error codes on the System Information screen
(
page 1-9 ), and perform recommended corrective actions
( page B-1 ).
•
Check the thermistor cable connection to the power PCBA
(
page 11-3 ).
•
Make sure that the thermistor wire and rivet are correctly
attached to the hose duct adapter (
page 11-4 ).
•
Check the heater cable connection to the power PCBA
(
page 10-31 ).
•
Try replacing components in the following order:
1. Thermistor sensor assembly (
page 11-3 ).
2. Power PCBA ( page 10-31 ).
Electromagnetic interference
between the warming unit
and other devices
•
Check the error codes on the System Information screen
(
page 1-9 ), and perform recommended corrective actions
( page B-1 ).
•
Advise the customer to try increasing the distance between
devices, repositioning the cabling, or plugging the devices into
separate outlet circuit branches. See
Electromagnetic Compati-
bility (EMC) on page 13-4 for additional guidance.
Table 6-1. Warming Unit Problems and Resolutions (Continued)
Problem Resolution