Dettson CC15-M-V, Installation Instructions And Homeowner'S Manual

Page: 31 / 40

CODE DESCRIPTION SOLUTION
55
The high pressure control (or switch) should not be
closed when the inducer is not running. If it is, this is a
sign of a serious condition. The switch may be welded
closed or purposely bypassed in the field. Before any
heat cycle can begin, the pressure switch is tested to
make sure that it is opened.
(1) Replace high pressure control (switch). (2)
Remove bypass and restore correct operation.
Determine reason for bypass (e.g. vent length too
long) and correct issue.
Notify homeowner and
proper authorities of illegal tampering if necessary.
(3) Check wiring and connections. Replace and/or
repair as necessary.
(4) Check for proper venting
and terminations as defined in the furnace installation
instructions.
57
This fault indicates that the high pressure switch is
open when the inducer is energized at high speed.
This fault can be displayed any time during the heat
call except during low heat call and only after the pre-
purge and blower on delays are complete.
(1)Check the vent system for blockage and proper
termination and repair as necessary. (2) Check the
specification sheets and/or installation instructions.
Remove excess venting. (3) Repair or replace inducer
and/or inducer wiring and/or electrical connections.
(4) Replace control board.
(5) Check wiring and
connections. Replace and/or repair as necessary.
(6) Replace hoses as necessary. (7) Insure proper
termination. (8) Replace the pressure switch.
68
If the furnace was in heating operation when this fault
occurred, the gas valve will immediately close (flame
will be lost), blower motor operation will immediately
stop and the furnace will shut down normally with
Inducer post-purge at the correct speed.
After
the post purge (or immediately if no heat call was
present), no other operation (including thermostat
calls) will occur until this fault is cleared.
(1) Check wiring, connectors and terminals – repair
or replace as necessary.
(2) Check line voltage
wiring, connectors and terminals to the inductance
and ECM motor. Repair and replace as necessary.
(3) Replace the furnace memory card with the correct
replacement part. (4) Replace the motor.
71
When attempting to communicate with the inducer
controller module (electronic control to the back of the
main board), communications cannot be established
or response from the inducer controller module is not
as expected.
Check the wiring between the furnace controller
(I.F.C.) and the inducer controller module.
Check
wiring between the inducer controller module and the
inducer. Check line voltage to the inducer controller
module. If these are ok, replace the inducer controller
module and/or inducer.
77
The furnace control has lost communications with the
gas valve.
(1) Check the wires, connectors or terminals between
the gas valve and furnace control (or I.F.C.). Replace
or repair as necessary. (2) Replace the gas valve. (3)
Replace the furnace control.
93
This is a severe fault that should rarely (if ever) be
discovered in the field. It is an indicator of an internal
microprocessor fault on the furnace control (or I.F.C.)
or voltage applied to the main gas valve solenoid
when there should be none.
(1) Check for miswiring in the furnace. (2) Replace
the furnace control (or I.F.C.).
31