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TROUBLESHOOTING GUIDE
The troubleshooting flow charts on the following pages provide systematic procedures for isolating equipment
problems. The charts are intended for use by a qualified gas heater service person.
DO NOT SERVICE THESE HEATERS UNLESS YOU HAVE BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
Digital Multimeter – for measuring AC and DC voltage and resistance.
•
Low Pressure Gauge – for checking inlet and outlet pressures of the gas control valve against rating plate
•
data.
INITIAL PREPARATION
1. Visually inspect equipment for apparent damage.
2. Check all wiring for loose connections and worn insulation.
Refer to the system operation sequence in this section to gain an understanding as to how the equipment operates
during a call for heat. Understanding the operation sequence of the ignition module and related components is
essential as it will relate directly to problem solving provided by the flow charts.
The ignition control module is self-diagnostic. A solid red light indicates normal operation. The red light on the
module will flash a specific pattern if a heater problem is identified, depending upon the problem which is
diagnosed.
To effectively use the flow chart, you must first identify what the problem is by the flashing pattern of the red
diagnostic light. If the light is flashing, the flash pattern will be followed by a pause and then a repeat of the flash
pattern until the problem is corrected.
Refer to the table below to identify the potential problem:
MODULE CODES
1 Flash
Air Flow Fault
2 Flashes
Flame Sensor Issue
3 Flashes
Ignition Lockout After 3 Tries
Components should be replaced only after each step has been completed and replacement is suggested in the flow
chart.
Series AA250
Page 22
LT252 Oct 2019
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