Wayne P250 - Troubleshooting Guide

64659-001 REV. A 07/06/18
22
TROUBLESHOOTING GUIDE
Symptom
Lights
Possible
Corrections
Flash
T-Input
Valve
Blower
24V/Cal
Appliance runs but
iHEAT system does
not run; combustion
motor does not turn
on, no heat to
appliance.
Off
Off
Off
Off
Off
1. Check to make sure burner
switch is on.
2. With burner switch on, check
for 120 volts across L1 and Neutral
terminals; repair if necessary.
3. With burner switch on, check
for 24 volts across 24Vac
terminals; repair if necessary.
Flash
Flash
Off
or
Flash
Off
On
1. Indicates signal from t-stat is
absent or not in proper range.
Check wiring connections at
COM(-) and 0-24V(+) or 4-20mA(+)
terminals.
2. Check t-stat for proper output.
Flash
On
Off
or
Flash
Flash
On
1. Check wiring connections at
MOTOR L and MOTOR N
terminals.
2. Check wiring connections at
the three TACH terminals.
3. Replace motor/blower.
Flash
Off
Off
Off
Off
Check dipswitches for proper
position.
Flash
Off
Off
On
Flash
System is in calibration mode.
Refer to Calibrating the Blower
section.