heat service-list shows down heat engines and some up

Issue

• Heat engines showing down

[stack@undercloud-6 ~]$ heat service-list
WARNING (shell) "heat service-list" is deprecated, please use "openstack orchestration service list" instead
+-----------------------------------+-------------+--------------------------------------+-----------------------------------+--------+----------------------------+--------+
| hostname                          | binary      | engine_id                            | host                              | topic  | updated_at                 | status |
+-----------------------------------+-------------+--------------------------------------+-----------------------------------+--------+----------------------------+--------+
| undercloud-6.default.redhat.local | heat-engine | 02b99519-19da-465f-9721-4a5b96f003cc | undercloud-6.default.redhat.local | engine | 2017-07-12T15:30:02.000000 | up     |
| undercloud-6.default.redhat.local | heat-engine | 207f878d-93e5-4196-8479-c8e6700c7e23 | undercloud-6.default.redhat.local | engine | 2017-07-12T15:30:02.000000 | up     |
| undercloud-6.default.redhat.local | heat-engine | 42366dec-e508-498c-a63c-60dce4351fb6 | undercloud-6.default.redhat.local | engine | 2017-07-12T15:30:02.000000 | up     |
| undercloud-6.default.redhat.local | heat-engine | 5536b70d-6471-4237-9306-38ff14bb2b5c | undercloud-6.default.redhat.local | engine | 2017-07-12T15:30:02.000000 | up     |
| undercloud-6.default.redhat.local | heat-engine | 6294fd47-0795-4075-a0c2-3d2a8473c490 | undercloud-6.default.redhat.local | engine | 2017-06-29T06:11:58.000000 | down   |
| undercloud-6.default.redhat.local | heat-engine | 62bd4822-ac92-4a7e-9307-c7832d83e7ba | undercloud-6.default.redhat.local | engine | 2017-06-29T06:11:58.000000 | down   |
| undercloud-6.default.redhat.local | heat-engine | 6586ff66-1aa8-472e-a95c-3dd620b5fcd1 | undercloud-6.default.redhat.local | engine | 2017-06-29T06:11:58.000000 | down   |