Continued on next page.
Burner does not light, oven Controller
is on, no spark at the Pilot�
Ignition (ICS) Modules
There are 2 versions of the ICS
module that have been used on
these ovens� Functionally they are
similar, however there are slight
differences in the wiring connections,
and differences in the functions of
the indicator lights� The Robertshaw
module has been used for a number
of years, more recent models will be
equipped with a Fenwal module� The
Robertshaw model may be replaced
with a Fenwal, but will require a
slight wiring modification, a Wire
Harness kit is available from your
distributor�
Note: If the Radiant Burner will not light, stay lit, or is going out intermittently,
the Radiant Burner should be removed for inspection and cleaning before
proceeding with additional troubleshooting� The majority of Radiant Burner
problems can be traced to debris in the Burner� See the “Repair Procedures”
section of this manual�
1. Check Igniter�
a. Inspect the Igniter for damage� Unplug the the Igniter lead and check for
continuity between the terminal end and the electrode� Replace Pilot/
Igniter Assembly if it is damaged�
2. Check ICS module�
a. When the oven is on, there should be 24 VAC present between the TH
and GND terminals on the module�
Robertshaw module: LED should be lit when 24 VAC present at the
Valve�
If LED is flashing, module has locked out. Turn off power to the oven for
5 seconds to reset�
Fenwal Module: LED is OFF when the module is functioning normally�
If LED is ON, there is an internal failure in the module and it must be
replaced� If LED is flashing 3 flashes in succession the module has locked
out� Turn off power to the oven for 5 seconds to reset�
b. If 24 VAC present at the ICS module (either type) between terminals TH
and GND: Turn the oven OFF� Disconnect the Igniter lead from the module�
Turn the oven back on� Within a few seconds you should here a distinct
repetitive clicking sound from the module indicating that it is creating
spark� If there is no clicking sound, replace the module� Before installing
new module, check Igniter and Gas Valve for shorts to ground and if
shorted replace accordingly�
3. Check Controller�
When oven is turned ON there should be 24 VAC at the output terminals
on the Controller (Brown and White wires)� If 24 VAC not present when
Controller is turned ON, replace Controller�
SYMPTOM PROBABLE CAUSE/SOLUTION
PG 8 OF 20
M0013.04 APRIL 2018
An ongoing program of product improvement may
require us to change specifications without notice.
WOOD STONE CORPORATION
1801 W. Bakerview Rd.
Bellingham, WA 98226 USA
TOLL FREE 800.988.8103
TEL 360.650.1111
FAX 360.650.1166
E-MAIL info@woodstone-corp.com
woodstone-corp.com
Bistro CE
Service Manual
TROUBLESHOOTING GUIDE
