Honeywell 238-47969-00A Manuel D’Utilisation

27 

None (LED not on or 
flashing) 

Millivolt power is not 
present. Light pilot. 

1.  Gas valve is functioning 

normally 

2.  Gas valve is not powered. 

Light pilot 

One flash and three 
second pause. 

If set point knob is in 
"PILOT" position then pilot 
flame is detected. 

 

Gas valve is powered and waiting 
for the set point knob to be turned 
to a water temperature setting. If 
the set point knob is at desired 
setting the thermostat is satisfied. 

LED strobe (two quick 
flashes) and three second 
pause 

Thermostat calling for heat 

 

Water heater operating normally. 

LED on continuously. 

Set point knob has been 
recently turned to the 
"OFF" position.  

Set point knob was recently turned 
to "OFF" position.  Wait until LED 
goes out before attempting to 
relight 

Two flashes and three 
second pause. 

Weak pilot flame detected. 
System will reset when 
pilot flame is sufficient.  

1.  Unstable pilot.  
2.  Pilot tube blocked or 

restricted.  

Three flashes and three 
second pause. 

Insufficient water heating. 
System will reset.  

1.  Temperature sensor out of 

calibration.  

2. Possible 

short. 

Four flashes and three 
second pause. 

Excessive tank 
temperature. System must 
be reset.  

1.  Temperature sensor out of 

calibration.  

2.  Faulty gas valve. 

Five flashes and three 
second pause. 

Temperature sensor fault. 

1.  Damage to the temperature 

wire. 

2. Temperature 

sensor 

resistance out of range.  

3.  Replace temperature sensor.  
4.  If temperature sensor 

replacement does not correct 
the problem; Verify control is 
not wet or physically damaged 

5.  Turn set point knob to "OFF" 

position. Turn set point knob 
to "PILOT" position and light 
pilot.                                         

6.  Replace gas valve if five flash 

error persists.