SECTION 12: TROUBLESHOOTING

12.1 Honeywell SmartValve® II Troubleshooting

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.

LED Status

Indicates

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 on Page 50,

 

Section 12.2.

WARNING

Electrical Shock Hazard

Do not disconnect ground leads inside heater.

Do not interchange grounded and ungrounded leads on transformer or ignition module.

Failure to follow these instructions can result in death or electrical shock.

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.

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Roberts Gorden CTH2-80, CTH2-125, CTH2-100, CTH2-150, CTH2-175 Honeywell SmartValve II Troubleshooting, LED Status Indicates

CTH2-40 CTH2-60, CTH2-175, CTH2-150, CTH2-100, CTH2-80 specifications

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