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SVC 810 Tankless Troubleshooting Manual

5. If the unit does not operate on initial installation or after replacement of the PCB, then the

circuit board requires programming with the fuel type and altitude chip.

WARNING: When replacing High Altitude Connector, turn off the electric power to water heater.

Install & adjust the proper Program chip according to the instruction. A different Program

chip is required for every 3,280 feet. The Program chip is not interchangeable between Indoor

and Outdoor models or type of gas. Check the number on the High Altitude Connector.

Error Code 90

Explanation: Blocked Flue. The venting system has failed the pre-purge test. At a minimum

check the following:

1. Ensure maximum vertical vent length and elbows do not exceed allowable limits.

2. Ensure maximum horizontal vent length and elbows do not exceed allowable limits.

3. Check heat exchanger flapper valve at vent connection of water heater moves freely.

4. Is the entire vent structure clear and clean of any obstructions?

5. Remove all obstructions. Check the vent termination on the outside of the building and

the flapper valve at the top of the heat exchanger

6. You may rule out the venting by temporarily disconnecting the vent structure from the

water heater. If this fixes the problem, then the issue lies in the venting. If this does not

fix the problem, then the issue lies in the blower motor or printed circuit board.

Yes

Was the proper

high altitude

fuel type

connector

installed?

Yes

Install or adjust the high altitude fuel

type chip/dip switch settings

Pull out the power cord to

disconnect electricity.

Reconnect power cord.

When the

ower turns on,

does the Error

Code 82 still

dis

The water heater seems to be normal.

Try to operate again.

lace the Printed Circuit Board and

ram chi

Rheem RTG74 User Manual

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