Troubleshooting; Introduction - Watts AERCO CFR 1500 Operation And Service Manual

SECTION 9 TROUBLESHOOTING
SECTION 9. TROUBLESHOOTING

9.1 Introduction

This section is intended to aid service/maintenance personnel in isolating the cause of a fault in your CFR boiler.
The troubleshooting procedures below are presented in tabular form on the following pages. These tables are
comprised of three columns labeled: Fault Indication, Probable Cause and Corrective Action. The numbered
items in the Probable Cause and Corrective Action columns correspond to each other. For example, Probable
Cause No. 1 corresponds to Corrective Action No. 1, etc.
Fault Correction Instructions
When a fault occurs in the unit, proceed as follows to isolate and correct the fault:
1. Observe the fault messages displayed on the Edge Controller.
2. Refer to the Fault Indication column in Troubleshooting Table 10-1, below, and locate the Fault that best
describes the existing conditions.
3. Proceed to the Probable Cause column and start with the first item (1) listed for the Fault Indication.
4. Perform the checks and procedures listed in the Corrective Action column for the first Probable Cause
candidate.
5. Continue checking each additional Probable Cause for the existing fault until the fault is corrected.
6. Section 9-2 contains additional troubleshooting information that may apply to situations in which no fault
message is displayed.
If the fault cannot be corrected using the information provided in the Troubleshooting Tables, contact your
local AERCO Representative.
TABLE 9-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Blower stopped running due to
thermal or current overload.
Blocked Blower inlet or inlet air
filter.
Blockage in Blower Proof switch.
Blockage in Blocked Inlet switch.
AIRFLOW FAULT
Defective Blower Proof switch.
DURING IGNITION
Defective Blocked Inlet switch.
Bad inlet air temperature sensor.
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Corrective Action
Check combustion blower for signs of excessive heat or high
current drain that may trip thermal or current overload
devices.
Inspect the inlet to the combustion blower including the air
filter at the air/fuel valve for signs of blockage.
Remove the Blower Proof switch and inspect for signs of
blockage, clean or replace as necessary.
Remove the Blocked Inlet switch and inspect for signs of
blockage, clean or replace as necessary.
Check the continuity of the Blower Proof switch with the
combustion blower running. If there is an erratic resistance
reading or the resistance reading is greater than zero ohms,
replace the switch.
Turn off unit and check the continuity of the Blocked Inlet
switch. If there is an erratic resistance reading or the resistance
reading is greater than zero, replace switch.
Check actual inlet air temperature reading and measure
resistance at the Sensor Harness connection P1. Verify reading
conforms to values shown in the reference manual.
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