andrews RFF 18/270 - User Manual

Questions and Answers

Q
qandersonAug 19, 2025
What to do if my andrews Water Heater has high water temperature?
- A
  Austin WilsonAug 19, 2025
  If the Andrews Water Heater detects a high water temperature (over 93°C), first, check the lower sensor to ensure it's fully inserted into the well and secured by the clip on the sensor wire. Then, check the readings of both the lower and upper sensors. If they are not within specifications, replace the sensor. If the sensors and wire harnesses are okay, replace the control board.
E
Erica Hernandez PhDAug 25, 2025
What to do if my andrews RFF 18/270 Water Heater detects flame before ignition?
- B
  Billy HoganAug 25, 2025
  If the Andrews Water Heater detects flame before ignition, check to ensure the gas valve has fully closed and that no voltage is present at the gas valve before the ignition cycle. Verify the wire positions on the wire harness are correct. If the gas valve is stuck open, it should be replaced.
M
Michael ChambersAug 26, 2025
What to do if my andrews Water Heater detects flame after heating cycle completes?
- W
  William HatfieldAug 26, 2025
  If the Andrews Water Heater detects flame after the heating cycle completes, check to ensure the gas valve has closed completely and that no voltage is present at the gas valve after the ignition cycle. Make sure the wire positions on the wire harness are correct. If the gas valve remains stuck open, replace it.
D
Dominique CarrollAug 28, 2025
What to do if my andrews RFF 18/270 shows maximum number of ignition recycles detected?
- C
  Christopher DavisAug 28, 2025
  If the Andrews Water Heater displays a 'Maximum number of ignition recycles detected' error, it means that the pilot flame is lost during the run cycle but then reestablished on the ignition cycle. Check the inlet gas pressure to ensure it does not drop below the minimum operating pressure specified on the rating label after the main gas valve opens. Verify that the gas pipe size to the water heater is adequate. Inspect the pilot shield position and the condition of the burners, cleaning or replacing them as needed. Check the pilot flame and observe the microamp output on the run cycle. Inspect the pilot tubing leading to the pilot and replace it if it is crimped or damaged. Replace the pilot if the wires, flame sensor, or electrode are damaged.
G
greenashleyAug 30, 2025
What causes AC line frequency error in andrews Water Heater?
- P
  Patrick RobersonAug 30, 2025
  If the Andrews Water Heater experiences an AC line frequency error, which indicates the signal is too noisy or the frequency is incorrect, check the line voltage frequency to the water heater and determine if there are wide fluctuations. If the problem persists, call an electrician. Ensure the water heater is on a separate electrical line.
K
Kathleen OwensSep 1, 2025
How to fix low flame sense on andrews RFF 18/270?
- C
  Cheryl BoydSep 1, 2025
  If the Andrews Water Heater has a low flame sense, determine the flame sense current in the Service mode while the water heater is operating. If it is less than 1.0 microamps, check the pilot flame sense rod with emery cloth. If the problem persists, replace the pilot.
D
David WileySep 3, 2025
What causes flame rod shorted to ground in andrews RFF 18/270?
- J
  Jesus RiveraSep 4, 2025
  If the Andrews Water Heater has a flame rod shorted to ground, check to see if the flame sensor wire has bare spots touching metal parts or if the flame sensor rod is touching the pilot shield or other metal parts. Replace the pilot if the flame sense wire is damaged or the flame rod is bent.
R
rodrigueztammieSep 5, 2025
What to do if andrews Water Heater flame sensed out of normal sequence?
- D
  Danny GordonSep 5, 2025
  If the Andrews Water Heater displays a 'Flame sensed out of normal sequence', check to make sure the gas valve has closed completely. Ensure no voltage is present at the gas valve before or after the ignition cycle. Verify the wire positions on the wire harness are correct. If the gas valve is stuck open, replace it.
A
Andrew HuangSep 8, 2025
Why is DC output voltage unstable in andrews Water Heater?
- C
  Cristian SandersSep 8, 2025
  If the Andrews Water Heater experiences unstable DC output voltage, check the line voltage to the water heater for erratic readings. Also, inspect the wiring to ensure there are no shorts. If the power supply and wiring are okay, replace the control board.
T
Taylor BellSep 9, 2025
How to troubleshoot faulty upper sensor reading on andrews Water Heater?
- C
  Christine BallardSep 9, 2025
  If the Andrews Water Heater indicates an upper sensor reading faulty, check the continuity of the wire harness to the upper sensor. If the wire harness is okay, replace the upper sensor.