Slant/Fin CHS-399 - Manual (Page 68)

Slant Fin Corp. │ Installation and Operation Instructions CHS Series
68
Table 15-1 Troubleshooting Chart
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Fowled or faulty flame sensor Inspect flame sensor for cracks of fowling, clean
or replace as necessary.
Lockout 173 - Pilot relay
feedback incorrect
Lockout 174 – Safety relay
feedback incorrect External Electrical Noise Look for sources of electrical noise, i.e. a large
motor or multiple pieces of equipment starting at
the same time.
Failing Limit Switch in ILK circuit Check operation of internal LWCO, and/or
external limit (i.e. devise connected between “R”
and “LIM”); replace as necessary
Hardware failure of Sola controller Reset power, If problem persists replace Sola
controller.
Alert 206 – Lead Lag header
temperature was invalid System Sensor not connected If desired, install System Sensor and wire to
SENSOR input connections “SYSTEM” and
“COM”. Otherwise ignore Alert 206
Alert 233 – Lead Lag outdoor
temperature was invalid See Alert 248
Alert 248 – CH outdoor
temperature was invalid Outdoor sensor not connected The CHS is factory set with Outdoor Reset
enabled. Connect outdoor sensor or disable
Outdoor Reset.
Outdoor sensor wiring Check wiring of outdoor sensor. Wires should
connect to SENSOR inputs “OUTDOOR” and
“COM”.
Faulty sensor Check sensor. Should be free of ice and snow.
Check resistance of sensor and compare to
thermistor resistance chart, see Table 15-2.
Alert 448 – Flame too low See Lockout 138
Alert 449 – Modulation rate
was limited due to flame
strength Normal operation Indicates that the minimum permissible
modulation rate was temporarily increased due to
low flame signal strength. If Alert persists, refer
to Lockout 138.
Inoperative CH and/or DHW
pump Blown fuse Check Fuse " B " .
Faulty Sola controller If Fuse “B” not blown, and Sola controller is
operating, navigate to pump diagnostic on display.
Manually switch pump on, check for 120VAC at
pump connection terminal on line voltage barrier
strip. If 120VAC not detected, replace Sola
controller.
Faulty pump If 120VAC supplied to pump, and pump does not
operate, replace pump.
Blower operating at high
speed while burner is off Blower signal cable disconnected

Verify that the 5-position Molex connector on
the wiring harness is securely connected to its
mating connector on the blower.

Check that the 4-position Molex connector on
wiring harness is securely connected to its
mating connector on the Sola controller.
No 24VAC to Sola controller

Check Power LED on Sola controller.

Check Fuse " C " .

With an AC voltmeter measure voltage at
terminals J8 1 & 2, 24VAC should be present.
Blower not operating
Blower power disconnected Verify that the 3-position Molex connector on the
wiring harness is securely connected to its mating
connector on the blower.