Kold-Draft Ice Machine Error Code 70: Cold Water or Switch Conflict

What does Kold-Draft error code 70 mean?

The same LED has two different jobs. On Rev 1.1 and 1.2, the controller sees the evaporator drop below 31 F during water fill only, and opens the hot gas valve to warm it to about 38 F. The display is 70 (LED 70), and the manual says it is not necessarily a malfunction: it can just mean very cold incoming water. The remedy there is no action, though incoming water above 45 F gives the best results. On Rev 1.3, Code 70 means the arm-up and arm-down cam switches are both closed, that is un-actuated, at the same time, which is not allowed. The manual's listed causes are loose or miswired switches, a bent bracket, loose cams, or a stuck arms-up or arms-down switch. The fix is to tighten the switches, wire them to Common and NC terminals, straighten the bracket, set the cams or replace a stuck switch.

Affected models and control systems

Kold-Draft GT36x, GT56x, GB56x and GB106x makers with K4B Rev 1.1 to 1.80. Read your board revision: Rev 1.1/1.2 means cold water, Rev 1.3 means a cam switch conflict.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• LED 70 on the controller
• Hot gas valve opening during fill (Rev 1.1/1.2)
• Water plate not moving (Rev 1.3)

Possible causes

Listed in Kold-Draft's documentation

• Very cold incoming water (Rev 1.1/1.2)
• Switches loose or miswired, bent bracket, loose cams, stuck arms-up or arms-down switch (Rev 1.3)

Other likely causes — what usually sits behind error code 70 on this control. A technician confirms which one it is before any part is replaced.

• A cold-water line from a well or a long outdoor run, in winter, dropping below 45 F
• A switch plunger gummed with ice melt residue

Safe checks before calling for service

How a technician diagnoses error code 70

1. Read the code and confirm the board revision.
2. On Rev 1.1/1.2 check the incoming water temperature.
3. On Rev 1.3 check that both cam switches are not closed together.
4. Tighten the switches and check wiring to the Common and NC terminals.
5. Straighten the bracket, set the cams, or replace a stuck switch.

How error code 70 differs from similar codes

Rev 1.1/1.2 treat Code 70 as an information code about cold water; Rev 1.3 treats it as a switch conflict.

Technical reference

Maker documentation

Kold-Draft owner support

Edition

Copyright 2015 Kold-Draft International; file named 'new 60 Series Service Manual rev041317' (Kold-Draft says it may not be current)

Models / control

Kold-Draft 60 Series electronic controller (K4B boards, revisions 1.1 to 1.80)

Section

Controller - Fault Codes (revision notes, pp. 21-22) and ERROR-CODE TROUBLESHOOTING (p. 23 onward)

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.