506566−01 09/10
Page 28
Critical alerts are displayed on Home (user) screen, in the Homeowner alert tab, and in
the Installer alert tab. Minor and Moderate alerts are found only in the Installer alert tab.
Table 4. Alert Codes and
Troubleshooting
Alert ID Action required to Clear/RecoverPriorityMessage Name
206 (Furnace) Gas Valve 2
nd
Stage
Relay
Critical Furnace will operate on 1
st
stage for remainder of the heating demand.
Will clear after fault recovered. If unable to operate 2nd stage, replace
control.
207 (Furnace) HSI Sensed Open Critical Measure resistance of hot surface ignitor. Replace if open or not within
specified range found in IOM. Resumes normal operation after fault is
cleared.
223 (Furnace) Low Pressure Switch
Open
Critical Check pressure (inches w.c.) of low pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent and combustion
air inducer for correct operation and restriction. Resumes normal opera-
tion after fault is cleared.
224 (Furnace) Low Pressure Switch
Stuck Closed
Critical Check operation of low pressure switch to see if it is stuck closed on heat
call longer than 150 seconds. Measure operating pressure (inches w.c.).
Inspect vent and combustion air inducer for correct operation and restric-
tion. Resumes normal operation after fault is cleared.
225 (Furnace) High Pressure Switch
Failed to Close
Critical Check pressure (inches w.c.) of high pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent and combustion
air inducer for correct operation and restriction. Resumes normal opera-
tion after fault is cleared.
226 (Furnace) High Pressure Switch
Stuck Closed
Critical Check operation of high pressure switch closing on heat call. Measure
operating pressure (inches w.c.). Inspect vent and combustion air inducer
for correct operation and restriction. Resumes normal operation after fault
is cleared.
227 (Furnace) Low Pressure Switch
Open in Run Mode
Moder-
ate
Check pressure (inches w.c.) of low pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent and combustion
air inducer for correct operation and restriction. Resumes normal opera-
tion after fault is cleared.
228 (Furnace) Inducer/Pressure
Switch
Calibration Failure
Moder-
ate
Unable to perform pressure switch calibration. Check vent system and
pressure switch wiring connections. Resumes normal operation after fault
is cleared.
240 (Furnace) Low Flame Current −
Run Mode
Moder-
ate
Check micro−amperes of flame sensor using control diagnostics or field−
installed mode. Clean or replace sensor. Measure voltage of neutral to
ground to ensure good unit ground. Alert clears after current heat call has
been completed.
241 (Furnace) Flame Out of Se-
quence −
Still Present
Critical Shut off gas. Check for gas valve leak. Replace, if necessary. Alert clears
when fault is recovered.
250 (Furnace) Primary Limit Switch
Open
Moder-
ate
Check for proper firing rate on furnace. Ensure there is no blockage in
heater. Check for proper air flow. If limit not closed within 3 minutes, unit
will go into 1−hour soft lockout. Resumes normal operation after fault is
cleared.
252 (Furnace) Discharge Air Temper-
ature High
Moder-
ate
Check temperature rise, air flow and input rate. Cleared when heat call is
finished.
270 (Furnace) Watch Guard −
Flame Failure on Ignite
Critical Check for proper gas flow. Ensure that ignitor is lighting burner. Check
flame sensor current. Clears when heat call finishes successfully.
271 (Furnace) Watch Guard −
Low Pressure Switch Open
Critical Check pressure (inches w.c.) of low pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent and combustion
air inducer for correct operation and restriction. Clears when heat call fin-
ishes successfully.
272 (Furnace) Watch Guard −
Low Pressure Switch Open Run
Mode
Critical Check operation of low pressure switch to see if it is stuck closed on heat
call. Check pressure (inches w.c.) of high pressure switch closing on heat
call. Measure operating pressure (inches w.c.). Inspect vent and combus-
tion air inducer for correct operation and restriction. Clears when heat call
finishes successfully.
273 (Furnace) Watch Guard −
Flame Fail in Run Mode
Critical Check micro−amperes of flame sensor using control diagnostics or field−
installed mode. Clean or replace sensor. Measure voltage of neutral to
ground to ensure good unit ground. Clears when heat call finishes suc-
cessfully.
table continued on next page
To Next Page
Loading...
