All installations and services must be performed by qualified service personnel.

DIAGNOSTIC FEATURES

The 50V61 control used on this furnace continuously monitors its operation and the operation of the system.

If the sensed failure is in the system (external to the control), the red LED will flash in the following flash- pause sequences to indicate failure status (each flash will last approximately 0.25 seconds, and each pause will last approximately 2 seconds):

1 flash, then pause

system lockout (retries or recycles exceeded)

2 flashes, then pause

low pressure switch stuck closed

3 flashes, then pause

low pressure switch stuck open

4 flashes, then pause

open high temperature limit switch

5 flashes, then pause

not used

6 flashes, then pause

115 V AC power reversed

7 flashes, then pause

low flame sense signal

8 flashes, then pause

check igniter or improper ground

9 flashes, then pause

high pressure switch stuck open

Continuous flash

flame sensed with gas valve de-energized

The LED will also flash once at power-up.

A green LED indicator is also present to obtain an estimate of the air flowrate (in CFM) produced by the house air blower. This LED cycles regularly by providing a constant light, followed by a sequence of flashes. Each flash can be translated to programmed CFM by using the following:

1 flash per 100(programmed) CFM

: Power must be disconnected before servicing.

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Thermo Products CDX1-75N, CHX1-125N, CHX1-75N, CHX1-100N, CDX1-125N, CDX1-100N operation manual Diagnostic Features

CDX1-100N, CDX1-125N, CHX1-100N, CHX1-75N, CHX1-125N specifications

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