Roberts Gorden CTH2-40 CTH2-60 Manuale Utente

49

This heater is supplied with the Honeywell Smart-
Valve

®

 II control system. This system is equipped with 

a diagnostic function that will assist in performing 
troubleshooting. The LED (Light Emitting Diode) indi-
cator at the top of the SmartValve

®

 II control will flash 

in various patterns to indicate status. The LED status 
indication chart provided below gives a summary of 
possible faults.

Off

No power to the control

Bright-Dim

Normal Operation.This indication 

shows whenever the system is pow-
ered, unless some abnormal event 
has occurred.

2 Flashes

Pressure switch remains closed lon-

ger than 30 seconds after a call for 
heat begins (pressure switch stuck 
closed). The SmartValve

®

 II checks 

the status of the pressure switch con-
tacts and must see a change in the 
contact with every firing cycle. Placing 
a jumper at the switch out of 
sequence will result in a fault, with the 
LED indicator flashing 2 times.

3 Flashes

Pressure switch remains open longer 

than 30 seconds after combustion air 
blower is energized. Check for correct 
blower operation, blower intake 
obstructions, pressure switch tubing 
and wiring.

4 Flashes

Limit string open, 2" white jumper wire 

on valve is loose.

5 Flashes

Flame signal sensed out of proper 

sequence.

6 Flashes

System Lockout. Flame sensing cir-

cuit is not functioning properly. Per-
form the checks following the "Does 
the burner stay lit?" bubble in the trou-
bleshooting flow chart 

Page 52, Section 12.3 will provide the information 
needed to test the manifold gas pressure setting. 
Page 50, Section 12.2 will guide you through several 
troubleshooting steps to determine possible prob-
lems with the systems.