Image forming system

1. An image forming system comprising:

an image forming unit configured to form a toner image on a recording material;

a fixing device configured to fix the toner image on the recording material on which the toner image is formed by said image forming unit;

a first cooling unit capable of cooling the recording material passed through said fixing device;

a second cooling unit capable of cooling the recording material passed through said first cooling unit; and

a control unit configured to carry out control so that during execution of an image forming job, the image forming job is stopped when both said first cooling unit and said second cooling unit are out of order and is continued when only one of said first cooling unit and said second cooling unit is out of order.

2. The image forming system according to claim 1 , wherein said fixing device includes a first rotatable member, a second rotatable member configured to feed the recording material in cooperation with said first rotatable member, and a heating unit configured to heat said first rotatable member, and

wherein in a case that only one of said first cooling unit and said second cooling unit is out of order, said control unit continues the image forming job when a temperature of said first rotatable member is lower than a predetermined temperature and stops the image forming job when the temperature of said first rotatable member is the predetermined temperature or higher.

3. The image forming system according to claim 2 , wherein in the case that only one of said first cooling unit and said second cooling unit is out of order, said control unit makes the predetermined temperature lower than a temperature in a case that both said first cooling unit and said second cooling unit are not out of order.

4. The image forming system according to claim 1 , wherein said control unit makes a feeding speed of the recording material, to be passed through said first cooling unit and said second cooling unit, slower in a case that only one of said first cooling unit and said second cooling unit is out of order than in a case that both said first cooling unit and said second cooling unit are out of order.

5. The image forming system according to claim 1 , further comprising a display portion,

wherein when both said first cooling unit and said second cooling unit are out of order, said control unit causes said display unit to display both said first cooling unit and said second cooling unit which are out of order, and

wherein when only one of said first cooling unit and said second cooling unit is out of order, said control unit causes said display portion to display said cooling unit which is out of order.

6. The image forming system according to claim 1 , further comprising a main assembly including said image forming unit and said fixing device,

wherein said first cooling unit is a first external cooling device connected to said main assembly, and

wherein said second cooling unit is a second external cooling device connected to said first external cooling device.

7. The image forming system according to claim 1 , further comprising a main assembly including said image forming unit, said fixing device and said first cooling unit,

wherein said second cooling unit is an external cooling device connected to said main assembly.