Diagnostics; Failure, Cause, Correction - Viessmann KW10A Operating Instructions And User's Information Manual

Boiler control unit for modulating temperature heating systems
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Operation

Diagnostics

Failure, cause, correction

Are all controls operating properly (i.e. thermostats,
low water cut-off, etc.)?
Are all wire connections tight and secure?
Symptom/Condition
Boiler control is not active
(GREEN power LED is not illuminated)
Burner does not activate, or activates
intermittently
(RED fault LED flashes)
F1 fuse blown
Burner does not activate
1
*
Red LED does not flash when Honeywell S8600 ignition control module is used with boiler.
8
Vitotronic 100, KW10A Operating and User's Information
Cause
Power switch "8" is in "0" position
Main power to boiler control and
heating system has not been
activated
Fuse on Vitotronic boiler control has
deactivated heating system
Burner is not electrically connected
Fixed high limit (FHL) tripped
1
No fuel *
Pumps on
Control calls for heat but burner does
1
not respond *
Control calls for heat but burner does
not respond
Other accessory defect
Correction
Ensure power switch "8" is in "
position.
Activate main power; ensure
120 VAC is supplied to control
(receptacle).
Replace fuse in control with same
type and rating
(F1: T 6.3 A / 250 V, slow blow).
Ensure 7-pole fA plug-in connection
to burner and/or power venter is/are
made.
Reset FHL by pushing in the pin,
labelled with a "E" (using a
ballpoint pen).
If a "click" can be heard, the limit
was tripped.
with oil: Ensure sufficient supply of oil
with gas: Open main gas supply valve
or
contact your local gas utility
Replace fuse
Attempt to reset burner using reset
button on the burner
(underneath burner hood).
Service burner if necessary.
Refer to troubleshooting section in
burner manual.
Power venter has to have separate
120 VAC power supply to motor (see
power venter instructions).
Refer to troubleshooting section in
power venter manual. Air proving
switch, blower wheel or timer/relay
inside power vent may be defective.
Ensure proper operation of all
accessories; replace if necessary.
Refer to technical literature supplied
with accessories.
I
"

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Vitotronic 100

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