Wayne P250 - Page 23

64659-001 REV. A 07/06/18
23
Symptom
Lights
Possible
Corrections
Flash
T-Input
Valve
Blower
24V/Cal
Appliance runs but
iHEAT system does
not run; combustion
motor turns on, no
heat to appliance
Flash
On
On
On
On
1. Check wiring connections at
RELAY COM and RELAY N.O.
terminals.
2. Check wiring connections on
ignition control. Verify 24 Vac
input to ignition control and 24
Vac at valve terminals on ignition
control during call for heat.
3. Check wiring connections at
VALVE (+) and VALVE(-) terminals
on iHEAT control. Check wiring
connections on white solenoid coil
of gas valve.
4. Check for proper connection of
black rectifier plug on gas valve.
5. Verify gas flow during ignition
trial. If gas flows but ignition does
not occur, correct ignition
problem. If gas does not flow
during ignition trial, diagnose
problem with gas valve.
Appliance runs,
temperature well
over t-stat set point,
will not control
appliance
temperature
Flash
On
On
On
On
1. Check wiring connections at 4-
20 mA(+) and COM(-) terminals
making sure + and - connections
from the control enclosure are in
the corresponding + and -
connections at the iHEAT control.
2. With the burner in the full fire
condition, check the inlet gas
pressure using the appropriate
pressure tap on the gas valve.
Check the adjustment of the
modulating gas valve's high
pressure setting. Refer to System
Set-up, Modulating Gas Valve
section.