PrecisionTemp
Cincinnati, Ohio
(513) 641-4446 Fax (513) 641-0733
www.precisiontemp.com
Rev 04/07
10
Troubleshooting
The RV-500 is equipped with self-diagnostics. In the event the red LED is flashing please re-
fer to the Service Codes section.
Most problems are easily remedied by consulting the trouble-shooting guide. If problems still
persist, contact PrecisionTemp or an authorized service center. Only a qualified technician
should do any work involving the gas system.
Heater Does Not Come On When The Water Turns On. Green LED Not Flashing.
1. Be sure all electrical connectors are secure and the polarity is correct. (Red wire to posi-
tive terminal) of RV electrical panel.
2. Be sure power is on and panel breaker is not tripped.
3. Check electrical contacts in electronics drawer. Be sure the connector with red and black
power wire is plugged into board. Using a voltmeter, check for 12Volts on this connector.
4. The fusible link in this wire might be blown. Replace power cord.
5. Be sure there is a battery in the system. Never connect the heater directly to a power con-
verter. Some converters have circuits that are not pure DC. (See the tag on red and
black power wire on the back of heater)
Green LED Flashing But Heater Does Not Come On When Water Flows
Be sure that no water-mixing valve has been left in the on position, using the showerhead
as a shut off. This will permit water to bypass the water heater and bleed cold water into
the hot water system. Always turn off both hot and cold water valves after using. Be sure
that the bypass valve at the water connections is in the "off" position.
Heater Does Not Come On When The Water Turns On. Red LED Is flashing a series
of three red Flashes, or a double red flash.
The T-Mid thermister (pair of yellow wires going to heat exchanger) is not connected or de-
fective. Be sure wiring harness connectors are secure and that wires are not chaffed. Be
sure connector is secure on electronics board. If these are secure, re-power unit. If the red
LED still flashes, contact factory for replacement thermister probe
Green LED Is Flashing But There Is No Ignition When Water Is On.
1. Be sure the gas valve at the tank is “On” and there is gas in the tank.
2. Be sure that gas is turned on and water flow is at least 0.4 gallon/minute.
3. Check that yellow ignition wire is clipped to the spark electrode terminal and is not touch-
ing anything else. Align so that it is not in contact with anything but the terminal.
4. With water running, check that the paddle wheel in the flow meter is turning counter-
clockwise. This can be visually observed with the access door open by looking through
the clear window of the flow meter.
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