ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE | CHECK/REPAIR | |
CONDITION/INDICATES | ||
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“Gas Valve Failure” | • Turn off power - check all wiring and connectors | |
| between the CCB’s J6 Socket (page 35) pins 2 | |
The control system has not detected any current | & 15 and the Gas Valve’s solenoid coil. Repair/ | |
replace anything worn or damaged as neces- | ||
through the gas valve after it has been energized. | ||
sary. | ||
| ||
| • Perform close visual inspection of the pins | |
| inside the CCB J6 plug and socket - ensure | |
| plugs and sockets are mating properly and pro- | |
| viding good contact. Repair/replace anything | |
| worn or damaged as necessary. | |
| • Turn off power - disconnect the Gas Valve wir- | |
| ing plug on top of the Gas Valve solenoid coil. | |
| Check Gas Valve solenoid coil resistance with | |
| an ohm meter at the solenoid coil terminals. | |
| Normal resistance is approximately 7 million | |
| ohms. If the Gas Valve solenoid coil is an open | |
| circuit - replace the Gas Valve. | |
| • Check for 24 VAC at CCB’s J6 Socket pins 2 & | |
| 15 during the Ignition Activation operating state | |
| (the Gas Valve status icon will be visible on the | |
| UIM display during this period. | |
| • Call the technical support phone number shown | |
| on the water heater labeling for further assis- | |
| tance if the problem has not been corrected | |
| after performing the procedures outlined here. | |
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| |
“Communication Failure” | • Turn off power - check the communication cable | |
| connections between the J2 Socket on the UIM | |
Loss of communication between the CCB and the | circuit board (page 27) and the CCB J16 Port | |
(page 35). | ||
UIM. | ||
• Try a new communication cable (standard cate- | ||
| ||
| gory V network cable) between the CCB and the | |
| UIM. | |
| • Call the technical support phone number shown | |
| on the water heater labeling for further assis- | |
| tance if the problem has not been corrected | |
| after performing the procedures outlined here. | |
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Technical Literature Department | 52 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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